// JavaScript Document
 $(document).ready(function(){
 
   $.ajax({
      url: class_url,         
	  cache: false,         
	  dataType: 'html',             
	  type:'GET',         
	  data: {},
	  error: function(xhr) { alert('Ajax request 發生錯誤'); }, 
	  success: function(response){  $('#leftclass').html(response); }	 
	  }); 

});