ajax delete && mysql

$(function(){
        $('.trash').click(function(){
            var del_id= $(this).attr('id');
            var $ele = $(this).parent().parent();
            $.ajax({
                type:'POST',
                url:'delete.php',
                data:del_id,
                success: function(data){
                    if(data=="YES"){
                        $ele.fadeOut().remove();
                        }else{
                            alert("can't delete the row")
                            }
                    }

                })
            })
    });

and also my "delete.php" page here:

<?php
include('../db_inc.php');
$music_number = "POST['del_id']";
echo '$music_number';
$qry = "DELETE FROM music WHERE msuic_id ='$music_number'";
$result=mysql_query($qry);

?>