I want upon unload detect the destinated url (how, this the problem)

I want upon unload detect the destinated url (how, this the problem)

  2. $(window).unload(function(){
  3.   alert("Goodbye1!");
  4.   if (window.location.indexOf("localhost/freelancerHelp/divsMoveShowPCH/")==-1) {
  5.     alert("Goodbye2!");
  6. }
  7. });

  9. // I want upon unload detect the destinated url (how, this the problem?) and appear a message only if not in my site the future url... how?