// JavaScript Document
//get_class
 function get_class()
   {
 		var http_request = false; 

       if (window.XMLHttpRequest) { // Mozilla, Safari,... 
           http_request = new XMLHttpRequest(); 
       } else if (window.ActiveXObject) { // IE 
           http_request = new ActiveXObject('Microsoft.XMLHTTP'); 
       } 
	   var steps = document.getElementById('step').value;
	   http_request.onreadystatechange = alertContents; 
	   http_request.open('POST', 'get_class.php'); 
       http_request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	         http_request.send('steps='+steps); 
	
   function alertContents() { 

       if (http_request.readyState == 4) { 
           if (http_request.status == 200) { 
               document.getElementById('show_classes').innerHTML =http_request.responseText;
			      
           } else { 
                document.getElementById('show_classes').innerHTML ='There was a problem with the request.'; 
           } 
       } 

   } 
   }
   //get_topics
 function get_topics()
   {
 		var http_request = false; 

       if (window.XMLHttpRequest) { // Mozilla, Safari,... 
           http_request = new XMLHttpRequest(); 
       } else if (window.ActiveXObject) { // IE 
           http_request = new ActiveXObject('Microsoft.XMLHTTP'); 
       } 
	   var classe = document.getElementById('classe').value;
	   http_request.onreadystatechange = alertContents; 
	   http_request.open('POST', 'get_class.php'); 
       http_request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	         http_request.send('classe='+classe); 
	
   function alertContents() { 

       if (http_request.readyState == 4) { 
           if (http_request.status == 200) { 
               document.getElementById('show_topics').innerHTML =http_request.responseText;
			      
           } else { 
                document.getElementById('show_topics').innerHTML ='There was a problem with the request.'; 
           } 
       } 

   } 
   }