I have magento shipping charge code :

<?php
ob_start();
// require_once(__DIR__ . '/app/Mage.php');
require_once('./../app/Mage.php');
umask(0);
ini_set('display_errors',true); 
ini_set('memory_limit', '1024M');
Mage::app()->loadArea('frontend');

function getShippingEstimate($productId,$productQty,$countryId,$postcode ) {

    // $quote = Mage::getModel('sales/quote')->setStoreId(Mage::app()->getStore('default')->getId());
    $quote = Mage::getModel('sales/quote')->setStoreId(Mage::app()->getStore('english')->getId());
    $_product = Mage::getModel('catalog/product')->load($productId);

    $_product->getStockItem()->setUseConfigManageStock(false);
    $_product->getStockItem()->setManageStock(false);

    $quote->addProduct($_product, $productQty);
    $quote->getShippingAddress()->setCountryId($countryId)->setPostcode($postcode); 
    $quote->getShippingAddress()->collectTotals();
    $quote->getShippingAddress()->setCollectShippingRates(true);
    $quote->getShippingAddress()->collectShippingRates();

    $_rates = $quote->getShippingAddress()->getShippingRatesCollection();

    $shippingRates = array();
    foreach ($_rates as $_rate):
            if($_rate->getPrice() > 0) {
                $shippingRates[] =  array("Title" => $_rate->getMethodTitle(), "Price" => $_rate->getPrice());
            }
    endforeach;

    return $shippingRates;

}

// echo "<pre>";
// product id, quantity, country, postcode
// print_r(getShippingEstimate('14419','1',"IN","642001"));

// echo "</pre>";

$results = getShippingEstimate('14419','1',"IN","642001");
// $results = getShippingEstimate('14419','1',"US","99501");
$count = -1;
echo "<select>";
foreach ($results as $result):
$count++;
?>
 <option value="<?php echo $count; ?>"> <?php echo $result["Title"]." - Rs ".$result["Price"]?>
 </option>

 <?php
endforeach;
echo "</select>"; 
?> 

The above code shown predefined shipping calculation, i need the country, postcode get from customer input form. my input form,

<form action='ajax_data.php' method='POST' >

<table border="0" cellspacing="1" cellpadding="2">
    <tr>
        <th> First Name : </th>
        <td> <input type="text" name="first_name"/> </td>
    </tr>
    <tr>
        <th> Last Name : </th>
        <td> <input type="text" name="last_name"/> </td>    
    </tr>

    <tr>
        <th> Address : </th>
        <td> <input type="text" name="address"/> </td>  
    </tr>

    <tr>
        <th> City : </th>
        <td> <input type="text" name="city"/> </td> 
    </tr>

    <tr>
        <th> State/Province : </th>
        <td> <input type="text" name="state_province"/> </td>   
    </tr>

    <tr>
        <th> Zip/Postal Code : </th>
        <td> <input type="text" name="zip_postal_code"/> </td>  
    </tr>

    <tr>
        <th> Country : </th>
        <td>    
            <select name="country"  style="width: 173px;">
                <option value="AFG">Afghanistan</option>
                <option value="ALA">Åland Islands</option>
                <option value="ALB">Albania</option>
                <option value="DZA">Algeria</option>
                <option value="ASM">American Samoa</option>
                <option value="AND">Andorra</option>
                <option value="AGO">Angola</option>
                <option value="AIA">Anguilla</option>
                <option value="ATA">Antarctica</option>
                <option value="ATG">Antigua and Barbuda</option>
                <option value="ARG">Argentina</option>
                <option value="ARM">Armenia</option>
                <option value="ABW">Aruba</option>
                <option value="AUS">Australia</option>
                <option value="AUT">Austria</option>
                <option value="AZE">Azerbaijan</option>
                <option value="BHS">Bahamas</option>
                <option value="BHR">Bahrain</option>
                <option value="BGD">Bangladesh</option>
                <option value="BRB">Barbados</option>
                <option value="BLR">Belarus</option>
                <option value="BEL">Belgium</option>
                <option value="BLZ">Belize</option>
                <option value="BEN">Benin</option>
                <option value="BMU">Bermuda</option>
                <option value="BTN">Bhutan</option>
                <option value="BOL">Bolivia, Plurinational State of</option>
                <option value="BES">Bonaire, Sint Eustatius and Saba</option>
                <option value="BIH">Bosnia and Herzegovina</option>
                <option value="BWA">Botswana</option>
                <option value="BVT">Bouvet Island</option>
                <option value="BRA">Brazil</option>
                <option value="IOT">British Indian Ocean Territory</option>
                <option value="BRN">Brunei Darussalam</option>
                <option value="BGR">Bulgaria</option>
                <option value="BFA">Burkina Faso</option>
                <option value="BDI">Burundi</option>
                <option value="KHM">Cambodia</option>
                <option value="CMR">Cameroon</option>
                <option value="CAN">Canada</option>
                <option value="CPV">Cape Verde</option>
                <option value="CYM">Cayman Islands</option>
                <option value="CAF">Central African Republic</option>
                <option value="TCD">Chad</option>
                <option value="CHL">Chile</option>
                <option value="CHN">China</option>
                <option value="CXR">Christmas Island</option>
                <option value="CCK">Cocos (Keeling) Islands</option>
                <option value="COL">Colombia</option>
                <option value="COM">Comoros</option>
                <option value="COG">Congo</option>
                <option value="COD">Congo, the Democratic Republic of the</option>
                <option value="COK">Cook Islands</option>
                <option value="CRI">Costa Rica</option>
                <option value="CIV">Côte d'Ivoire</option>
                <option value="HRV">Croatia</option>
                <option value="CUB">Cuba</option>
                <option value="CUW">Curaçao</option>
                <option value="CYP">Cyprus</option>
                <option value="CZE">Czech Republic</option>
                <option value="DNK">Denmark</option>
                <option value="DJI">Djibouti</option>
                <option value="DMA">Dominica</option>
                <option value="DOM">Dominican Republic</option>
                <option value="ECU">Ecuador</option>
                <option value="EGY">Egypt</option>
                <option value="SLV">El Salvador</option>
                <option value="GNQ">Equatorial Guinea</option>
                <option value="ERI">Eritrea</option>
                <option value="EST">Estonia</option>
                <option value="ETH">Ethiopia</option>
                <option value="FLK">Falkland Islands (Malvinas)</option>
                <option value="FRO">Faroe Islands</option>
                <option value="FJI">Fiji</option>
                <option value="FIN">Finland</option>
                <option value="FRA">France</option>
                <option value="GUF">French Guiana</option>
                <option value="PYF">French Polynesia</option>
                <option value="ATF">French Southern Territories</option>
                <option value="GAB">Gabon</option>
                <option value="GMB">Gambia</option>
                <option value="GEO">Georgia</option>
                <option value="DEU">Germany</option>
                <option value="GHA">Ghana</option>
                <option value="GIB">Gibraltar</option>
                <option value="GRC">Greece</option>
                <option value="GRL">Greenland</option>
                <option value="GRD">Grenada</option>
                <option value="GLP">Guadeloupe</option>
                <option value="GUM">Guam</option>
                <option value="GTM">Guatemala</option>
                <option value="GGY">Guernsey</option>
                <option value="GIN">Guinea</option>
                <option value="GNB">Guinea-Bissau</option>
                <option value="GUY">Guyana</option>
                <option value="HTI">Haiti</option>
                <option value="HMD">Heard Island and McDonald Islands</option>
                <option value="VAT">Holy See (Vatican City State)</option>
                <option value="HND">Honduras</option>
                <option value="HKG">Hong Kong</option>
                <option value="HUN">Hungary</option>
                <option value="ISL">Iceland</option>
                <option value="IND">India</option>
                <option value="IDN">Indonesia</option>
                <option value="IRN">Iran, Islamic Republic of</option>
                <option value="IRQ">Iraq</option>
                <option value="IRL">Ireland</option>
                <option value="IMN">Isle of Man</option>
                <option value="ISR">Israel</option>
                <option value="ITA">Italy</option>
                <option value="JAM">Jamaica</option>
                <option value="JPN">Japan</option>
                <option value="JEY">Jersey</option>
                <option value="JOR">Jordan</option>
                <option value="KAZ">Kazakhstan</option>
                <option value="KEN">Kenya</option>
                <option value="KIR">Kiribati</option>
                <option value="PRK">Korea, Democratic People's Republic of</option>
                <option value="KOR">Korea, Republic of</option>
                <option value="KWT">Kuwait</option>
                <option value="KGZ">Kyrgyzstan</option>
                <option value="LAO">Lao People's Democratic Republic</option>
                <option value="LVA">Latvia</option>
                <option value="LBN">Lebanon</option>
                <option value="LSO">Lesotho</option>
                <option value="LBR">Liberia</option>
                <option value="LBY">Libya</option>
                <option value="LIE">Liechtenstein</option>
                <option value="LTU">Lithuania</option>
                <option value="LUX">Luxembourg</option>
                <option value="MAC">Macao</option>
                <option value="MKD">Macedonia, the former Yugoslav Republic of</option>
                <option value="MDG">Madagascar</option>
                <option value="MWI">Malawi</option>
                <option value="MYS">Malaysia</option>
                <option value="MDV">Maldives</option>
                <option value="MLI">Mali</option>
                <option value="MLT">Malta</option>
                <option value="MHL">Marshall Islands</option>
                <option value="MTQ">Martinique</option>
                <option value="MRT">Mauritania</option>
                <option value="MUS">Mauritius</option>
                <option value="MYT">Mayotte</option>
                <option value="MEX">Mexico</option>
                <option value="FSM">Micronesia, Federated States of</option>
                <option value="MDA">Moldova, Republic of</option>
                <option value="MCO">Monaco</option>
                <option value="MNG">Mongolia</option>
                <option value="MNE">Montenegro</option>
                <option value="MSR">Montserrat</option>
                <option value="MAR">Morocco</option>
                <option value="MOZ">Mozambique</option>
                <option value="MMR">Myanmar</option>
                <option value="NAM">Namibia</option>
                <option value="NRU">Nauru</option>
                <option value="NPL">Nepal</option>
                <option value="NLD">Netherlands</option>
                <option value="NCL">New Caledonia</option>
                <option value="NZL">New Zealand</option>
                <option value="NIC">Nicaragua</option>
                <option value="NER">Niger</option>
                <option value="NGA">Nigeria</option>
                <option value="NIU">Niue</option>
                <option value="NFK">Norfolk Island</option>
                <option value="MNP">Northern Mariana Islands</option>
                <option value="NOR">Norway</option>
                <option value="OMN">Oman</option>
                <option value="PAK">Pakistan</option>
                <option value="PLW">Palau</option>
                <option value="PSE">Palestinian Territory, Occupied</option>
                <option value="PAN">Panama</option>
                <option value="PNG">Papua New Guinea</option>
                <option value="PRY">Paraguay</option>
                <option value="PER">Peru</option>
                <option value="PHL">Philippines</option>
                <option value="PCN">Pitcairn</option>
                <option value="POL">Poland</option>
                <option value="PRT">Portugal</option>
                <option value="PRI">Puerto Rico</option>
                <option value="QAT">Qatar</option>
                <option value="REU">Réunion</option>
                <option value="ROU">Romania</option>
                <option value="RUS">Russian Federation</option>
                <option value="RWA">Rwanda</option>
                <option value="BLM">Saint Barthélemy</option>
                <option value="SHN">Saint Helena, Ascension and Tristan da Cunha</option>
                <option value="KNA">Saint Kitts and Nevis</option>
                <option value="LCA">Saint Lucia</option>
                <option value="MAF">Saint Martin (French part)</option>
                <option value="SPM">Saint Pierre and Miquelon</option>
                <option value="VCT">Saint Vincent and the Grenadines</option>
                <option value="WSM">Samoa</option>
                <option value="SMR">San Marino</option>
                <option value="STP">Sao Tome and Principe</option>
                <option value="SAU">Saudi Arabia</option>
                <option value="SEN">Senegal</option>
                <option value="SRB">Serbia</option>
                <option value="SYC">Seychelles</option>
                <option value="SLE">Sierra Leone</option>
                <option value="SGP">Singapore</option>
                <option value="SXM">Sint Maarten (Dutch part)</option>
                <option value="SVK">Slovakia</option>
                <option value="SVN">Slovenia</option>
                <option value="SLB">Solomon Islands</option>
                <option value="SOM">Somalia</option>
                <option value="ZAF">South Africa</option>
                <option value="SGS">South Georgia and the South Sandwich Islands</option>
                <option value="SSD">South Sudan</option>
                <option value="ESP">Spain</option>
                <option value="LKA">Sri Lanka</option>
                <option value="SDN">Sudan</option>
                <option value="SUR">Suriname</option>
                <option value="SJM">Svalbard and Jan Mayen</option>
                <option value="SWZ">Swaziland</option>
                <option value="SWE">Sweden</option>
                <option value="CHE">Switzerland</option>
                <option value="SYR">Syrian Arab Republic</option>
                <option value="TWN">Taiwan, Province of China</option>
                <option value="TJK">Tajikistan</option>
                <option value="TZA">Tanzania, United Republic of</option>
                <option value="THA">Thailand</option>
                <option value="TLS">Timor-Leste</option>
                <option value="TGO">Togo</option>
                <option value="TKL">Tokelau</option>
                <option value="TON">Tonga</option>
                <option value="TTO">Trinidad and Tobago</option>
                <option value="TUN">Tunisia</option>
                <option value="TUR">Turkey</option>
                <option value="TKM">Turkmenistan</option>
                <option value="TCA">Turks and Caicos Islands</option>
                <option value="TUV">Tuvalu</option>
                <option value="UGA">Uganda</option>
                <option value="UKR">Ukraine</option>
                <option value="ARE">United Arab Emirates</option>
                <option value="GBR">United Kingdom</option>
                <option value="USA">United States</option>
                <option value="UMI">United States Minor Outlying Islands</option>
                <option value="URY">Uruguay</option>
                <option value="UZB">Uzbekistan</option>
                <option value="VUT">Vanuatu</option>
                <option value="VEN">Venezuela, Bolivarian Republic of</option>
                <option value="VNM">Viet Nam</option>
                <option value="VGB">Virgin Islands, British</option>
                <option value="VIR">Virgin Islands, U.S.</option>
                <option value="WLF">Wallis and Futuna</option>
                <option value="ESH">Western Sahara</option>
                <option value="YEM">Yemen</option>
                <option value="ZMB">Zambia</option>
                <option value="ZWE">Zimbabwe</option>
            </select>

        </td>
    </tr>

    <tr>
        <th> Email Id : </th> 
        <td> <input type="text" name="email_id"/></td>
    </tr>

    <tr>
        <th> Mobile Number : </th> 
        <td><input type="text" name="mobile_number"/></td>
    </tr>

    <tr>
        <th>I have : </th>
        <td>
            <select id="old" name="i_have">
                <option value = "select_option">Select Option</option>
                <option value = "three_compact">3 Compact</option>
                <option value = "three_regular">3 Regular</option>
                <option value = "three_triple">3 Triple</option>
                <option value = "five_compact">5 Compact</option>
                <option value = "five_regular">5 Regular</option>
                <option value = "five_triple">5 Triple</option>
                <option value = "seven_compact">7 Compact</option>
                <option value = "seven_regular">7 Regular</option>
                <option value = "seven_triple">7 Triple</option>
                <option value = "nine_compact">9 Compact</option>
                <option value = "nine_regular">9 Regular</option>
                <option value = "nine_triple">9 Triple</option>
            </select>
        </td>
    </tr>

    <tr>
        <th>I want : </th>
        <td>
            <select id="new" name="i_want">
                <option value = "select_option">Select Option</option>
                <option value = "three_compact">3 Compact</option>
                <option value = "three_regular">3 Regular</option>
                <option value = "three_triple">3 Triple</option>
                <option value = "five_compact">5 Compact</option>
                <option value = "five_regular">5 Regular</option>
                <option value = "five_triple">5 Triple</option>
                <option value = "seven_compact">7 Compact</option>
                <option value = "seven_regular">7 Regular</option>
                <option value = "seven_triple">7 Triple</option>
                <option value = "nine_compact">9 Compact</option>
                <option value = "nine_regular">9 Regular</option>
                <option value = "nine_triple">9 Triple</option>
            </select>
        </td>
    </tr>

    <tr>
        <th>Price (Rs) : </th>
        <td id="result"></td> 
            <input type="hidden" name="price" id="price"/>
        </tr>

    <tr>
        <th>Shipping Weight : </th> 
        <td id="show"></td>
        <input type="hidden" name="shipping_weight" id="shipping_weight"/>
    </tr> 
    <tr>
        <th>Shipping Cost (Rs) : </th> 
        <td id="findata"></td>
         <input type="hidden" name="shipping_cost" id="shipping_cost"/>
        </tr> 
    <tr>
        <th> Grand Total: </th> 
        <td> <input type="text" name="grand_total"/></td>
    </tr>       

</table> <br/> 

    <!-- <b><div id="result" name="price"></div></b> -->

    <input type="Submit" value="Pay" name="pay"/>

</form>

The Shipping Cost (Rs) column should be auto responce,