step1 batch in dynamically loaded after selecting one of the value from dropdown step 2 is loaded by ajax call in setp 2 when i click on edit step 3 is loaded via ajax call again in step 3 when i click on edit ajax call is working fine but its nit posting the value to php script

             //ajax call
             function validateFees(strAddNo) {  

          var collectFees = $("#collectFees").val();
          if(collectFees == "")
{
    $("#validateFeesResult").html('<div class="info">Please enter your Fees Amount.</div>');
    $("#collectFees").focus();
}

else
{
    var dataString = 'collectFees' + collectFees + 'strAddNo' + strAddNo;
    $.ajax({
        type: "POST",
        url: "validateFees_script.php",
        data: dataString,           
        cache: false,
        beforeSend: function() 
        {
            $("#validateFeesResult").html('Loading...');
        },
        success: function(response)
        {
            $("#validateFeesResult").hide().fadeIn('slow').html(response);
        }
    });
}

}

I'm sure it's extremely simple but I'm not understanding how to do it?