// Wenn onchange bei Checkbox
function change_content(content) 
{
  var url  = "../../../change_content.php?site="+content; 
  myAjax_request(url); 
}

// Erstellt das Request Objekt
function createRequestObject() 
{
  var ro;
  var browser = navigator.appName;
  if(browser == "Microsoft Internet Explorer")
  {
    ro = new ActiveXObject("Microsoft.XMLHTTP");
  }
  else
  {
    ro = new XMLHttpRequest();
  }
  return ro;
}
var http = createRequestObject();

function myAjax_response() 
{
  if(http.readyState == 4)
  {
    // Antwort vom Server
    var response = http.responseText;
    if(response != 'false') 
	{
	  var elem = document.getElementById("myAjax"); 
	  elem.innerHTML = response;
    }
  }
}

function myAjax_request(url) 
{
  http.open('get', url);
  http.onreadystatechange = myAjax_response;
  http.send(null);
}