function externalLinks() {
	 if (!document.getElementsByTagName) return;
	 var anchors = document.getElementsByTagName("a");
	 for (var i=0; i<anchors.length; i++) {
	   var anchor = anchors[i];
	   if (anchor.getAttribute("href") &&
		   anchor.getAttribute("rel") == "external")
		 anchor.target = "_blank";
	 }
}

function display_prono(id_course)
{
  if (window.XMLHttpRequest)
  { 
  	var request =  new XMLHttpRequest();
  }
  else if (window.ActiveXObject) 
  {
	try 
	{
		request = new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch (e) 
	{
		request = new ActiveXObject("Microsoft.XMLHTTP");
	}
  }
  
  request.open("POST", 'ajax/index.php?id_course='+id_course, true);
  request.setRequestHeader("Content-Type",
                           "application/x-www-form-urlencoded");

  request.onreadystatechange = function() {
    var done = 4, ok = 200;
    if (request.readyState == done && request.status == ok) {
      if (request.responseText) {
		  var obj = document.getElementById(id_course);
		  obj.innerHTML=request.responseText;
      }
    }
  };
  request.send(null);
  
  
 
}

function display_post(post_id)
{
  if (window.XMLHttpRequest)
  { 
  	var request =  new XMLHttpRequest();
  }
  else if (window.ActiveXObject) 
  {
	try 
	{
		request = new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch (e) 
	{
		request = new ActiveXObject("Microsoft.XMLHTTP");
	}
  }
  
  request.open("POST", 'ajax/index.php?post_id='+post_id, true);
  request.setRequestHeader("Content-Type",
                           "application/x-www-form-urlencoded");

  request.onreadystatechange = function() {
    var done = 4, ok = 200;
    if (request.readyState == done && request.status == ok) {
      if (request.responseText) {
		  var obj = document.getElementById('post_'+post_id);
		  obj.innerHTML=request.responseText;
      }
    }
  };
  request.send(null);
}