Drag drop update error and remove button

[maltesersssss]

I have a drag and drop shopping cart, and I've got a problem in updating the total price once I removed one item. and whenever I remove the item the table is still remain.

Here's my addtocart PHP

<?php

define('INCLUDE_CHECK',1);
require "../connect.php";

if(!$_POST['img']) die("There is no such product!");

$img=mysql_real_escape_string(end(explode('/',$_POST['img'])));
$row=mysql_fetch_assoc(mysql_query("SELECT * FROM products WHERE img='".$img."'"));

echo '{status:1,id:'.$row['id'].',price:'.$row['price'].',txt:\'\
\
<table width="260" id="table_'.$row['id'].'">\
  <tr>\
    <td width="60%" style="display:none;"><input type="text" name="id[]" value="'.$row['id'].'" style="width: 30px; border-width: 0px;"></td>\
    <td width="60%"><input type="text" name="roomname[]" value="'.$row['name'].'" style="width: 95px; border-width: 0px;"></td>\
    <td width="10%"><input type="text" name="price[]" value="'.$row['price'].'" style="width: 40px; border-width: 0px;"></td>\
    <td width="15%"><select name="qty[]" id="'.$row['id'].'_cnt" onchange="change('.$row['id'].');" style="width: 30px;">\
    <option value="1">1</option>\
        <option value="2">2</option>\
            <option value="3">3</option>\
    </slect>\
    \
    </td>\
    <td width="15%"><a href="#" onclick="remove('.$row['id'].');return false;" class="remove">remove</a></td>\
  </tr>\
</table>\'}';
?>

My javascript.

var purchased=new Array();
var totalprice=0;

$(document).ready(function(){

    $('.product').simpletip({

        offset:[40,0],
        content:'<img src="img/ajax_load.gif" alt="loading" style="margin:10px;" />',
        onShow: function(){

            var param = this.getParent().find('img').attr('src');

            if($.browser.msie && $.browser.version=='6.0')
            {
                param = this.getParent().find('img').attr('style').match(/src=\"([^\"]+)\"/);
                param = param[1];
            }

            this.load('ajax/tips.php',{img:param}); 
        } 

    });

    $(".product img").draggable({

    containment: 'document',
    opacity: 0.6,
    revert: 'invalid',
    helper: 'clone',
    zIndex: 100

    });

    $("div.content.drop-here").droppable({

            drop:
                    function(e, ui)
                    {
                        var param = $(ui.draggable).attr('src');

                        if($.browser.msie && $.browser.version=='6.0')
                        {
                            param = $(ui.draggable).attr('style').match(/src=\"([^\"]+)\"/);
                            param = param[1];
                        }

                        addlist(param);
                    }

    });

});


function addlist(param)
{
    $.ajax({
    type: "POST",
    url: "ajax/addtocart.php",
    data: 'img='+encodeURIComponent(param),
    dataType: 'json',
    beforeSend: function(x){$('#ajax-loader').css('visibility','visible');},
    success: function(msg){

        $('#ajax-loader').css('visibility','hidden');
        if(parseInt(msg.status)!=1)
        {
            return false;
        }
        else
        {
            var check=false;
            var cnt = false;

            for(var i=0; i<purchased.length;i++)
            {
                if(purchased[i].id==msg.id)
                {
                    check=true;
                    cnt=purchased[i].cnt;

                    break;
                }
            }

            if(!cnt)
                $('#item-list').append(msg.txt);

            if(!check)
            {
                purchased.push({id:msg.id,cnt:1,price:msg.price});
            }
            else
            {
                if(cnt>=3) return false;

                purchased[i].cnt++;
                $('#'+msg.id+'_cnt').val(purchased[i].cnt);
            }

            totalprice+=msg.price;
            update_total();

        }

        $('.tooltip').hide();

    }
    });
}

function findpos(id)
{
    for(var i=0; i<purchased.length;i++)
    {
        if(purchased[i].id==id)
            return i;
    }

    return false;
}

function remove(id)
{
    var i=findpos(id);

    totalprice-=purchased[i].price*purchased[i].cnt;
    purchased[i].cnt = 0;

    $('#table_'+id).remove();
    update_total();
}

function change(id)
{
    var i=findpos(id);

    totalprice+=(parseInt($('#'+id+'_cnt').val())-purchased[i].cnt)*purchased[i].price;

    purchased[i].cnt=parseInt($('#'+id+'_cnt').val());
    update_total();
}

function update_total()
{
    if(totalprice)
    {
        $('#total').html('total: $'+totalprice);
        $('a.button').css('display','block');
    }
    else
    {
        $('#total').html('');
        $('a.button').hide();
    }
}