$("li.university").click(function(){
  var id = $(this).attr("rel");
  $.get("data.aspx?type=u&id="+id ,
  function(html){$("#universityselect").html(html);});
});
$("li.universityselect").click(function(){
  var id = $(this).attr("rel");
  $.get("data.aspx?type=s&id="+id ,
  function(html){$("#coursetype").html(html);});
});
$("li.course").click(function(){
  //var id = $(this).attr("rel");
  alert("dd");
  //$.get("data.aspx?type=p&id="+id ,
  //function(html){$("#sourseselect").html(html);});
});