AJAX / PHP form submit issue

I trying to upgrade a website to make it easily replicable and more database driven.

My forms use PHP / AJAX to submit to response.php within the same directory.

E.G domain.com/client1/login.php this would use JS in /js/common.js

common.js will take the variables from the form name and use domain.com/client1/response.php?action=login

The issue I am having is that despite login.php and response.php both being in client1/, the JS is trying to locate response.php at domain.com/response.php

Is there a way of forcing the JS to use the local directory or taking my php url: ‘$isteURL/response.php’,

Any help would be gratefully appreciate, racking my head here.

$siteURL is defined in the header.php above the JS file

    function submitForm3() {        
    var data = $("#reset-form").serialize();
    $.ajax({                
        type : 'POST',
        url  : '<?php echo $siteURL; ?>/response.php?action=reset',
        data : data,
        beforeSend: function(){ 
            $("#error").fadeOut();
            $("#reset_button").html('<span class="glyphicon glyphicon-transfer"></span> &nbsp; sending ...');
        },
        success : function(response){           
            if($.trim(response) === "1"){
                console.log('dddd');                                    
                $("#reset-submit").html('Email sent ...');
                setTimeout(' window.location.href = "index.php?resetStatus=1"; ',2000);
            } else {                                    
                $("#error").fadeIn(1000, function(){                        
                    $("#error").html(response).show();
                });
            }
        }
    });
    return false;
}