debug ajax php with netbeans xdebug

I have jquery making an ajax call to another php file and cannot workout how to get netbeans and xdebug to stop at a breakpoint on this file.EG:

index.php

function ajaxfunc(){    ...}

other.php

<?php    echo Whatever::doit();    class Whatever(){            public function doit(){                $stopme="now";            }    }?>

Netbeans stops at code in index.php but not in other.php