please some one help me,i have created this code for searching from database but the problem is i am getting an output without even searching,i am no php expert,so please guys help me.

<form method="post"  action="<?php echo $_SERVER['PHP_SELF'] ?>" onSubmit="return validateThis(this)"> <!-- Sending Search Keyword to "search_handler.php" -->
							<label for="name" id="lname">Search Here:</label>
							<input type="text" class="text" name="tag" id="tag" onfocus="input_focus('tag');" onblur="input_blur('tag');" size="50" />
	<input type="submit" class="submit" name="send_contact" value="Send" />

$tag = @$_POST['tag'];
$con = mysql_connect("localhost","root","");
	if (!$con)
		die('Could not connect: ' . mysql_error());
	mysql_select_db("root", $con);
	$result =mysql_query("Select * FROM `superbnexus`.`products` WHERE `prname`LIKE '%".$tag."%'");

//echo $tag;

if($row = mysql_fetch_array($result))
    echo "<b>Name: </b>".$row[0]."<br>";
    echo "<b>Product Details: </b>".$row[3]."<br>";
    echo "<b>Product Price: </b>".$row[4]."<br>";
    echo "<em>To Buy this Product you have to Register. To Register go to <i>Customer Menu > Product List</i></em>";
    echo "<strong>The Product you are Searching is Not Available right now!</strong>";


In the text box you have mention

onfocus="input_focus('tag');" onblur="input_blur('tag');"

try to remove and check

you can wrap you search code (right before $tag and after mysql_close() in an if statement like:

// this will only run the php code if the submit button was pressed on your page.
if (isset($_POST['submit'])) {
   // rest of your code.