function makeObject(){ 
   var x; 
   if (window.ActiveXObject) { 
      x = new ActiveXObject("Microsoft.XMLHTTP"); 
   }else if (window.XMLHttpRequest) { 
      x = new XMLHttpRequest(); 
   } 
   return x; 
} 
var request = makeObject();

var the_content; 
function check_content(the_content){ 
   request.open('get', the_content); 
   request.onreadystatechange = parseCheck_content; 
   request.send(''); 
} 
function parseCheck_content(){ 
   if(request.readyState == 1){ 
      document.getElementById('inhoudcontent').innerHTML = '<center><br /><br /><img src="images/loader.gif" /></center>';
   } 
   if(request.readyState == 4){ 
      var answer = request.responseText; 
      document.getElementById('inhoudcontent').innerHTML = answer; 
  
    } 
}