每个$ .post函数都已停止工作，但其他Jquery函数仍然有效

Question

I'm out of ideas, i have around 20 $.post functions that will not work but the strange thing is everything is working perfectly on my local server. I've removed every file from the server and copied a freshly over and still nothing. I've tried other jquery functions like toggle etc and they work fine. There's just no response with any $.post function. I've now removed all other javascript files from the head of the document, included only jquery and included this code for testing.

<script src="includes/javascript/jquery.js"></script>
<script>
$(document).ready(function(){
  $("p").toggle(
    function(){$("p").css({"color":"red"});},
    function(){$("p").css({"color":"blue"});},
    function(){$("p").css({"color":"green"});   
  });


  $.post("test.php",function(data){
  alert('hello');
  });
});

</script>

toggle works fine but cant even alert out inside of a $.post function. Trying to alert data brings nothing either.