document.write('<div id="lastElement" style="clear:both;height:0" ></div>');

if(!window.getAbsolutePosition) window.getAbsolutePosition = function (theElement)
{
  var x = 0, y = 0;
  
  while(theElement != null){
    x += theElement.offsetLeft;
    y += theElement.offsetTop;
    theElement = theElement.offsetParent;
  }
  
  return {x:x,y:y};
}

if(!window.querystring) window.querystring = function(key)
{
	var query = window.location.search;
	var idx = query.indexOf('?' + key + '=');
	if(idx < 0) idx = query.indexOf('&' + key + '=');
	if(idx < 0) return null;
	var endidx = query.indexOf('&',idx+1);
	if(endidx < 0) endidx = query.length;
	return query.substring(idx+ ('?' + key + '=').length,endidx);
}


function updateFrameHeight()
{
	if(!window.parent || window.parent == window) return;
	//var zl_frameid = zl_getCookie('the_frameid');
	
	var height = document.getElementsByTagName('body')[0].offsetHeight;  // getAbsolutePosition(document.getElementById('lastElement')).y;
	
	if(height != updateFrameHeight.lastHeight)
	{
	  try {
		
		if(parent.updateFrameHeight) parent.updateFrameHeight(height, querystring("frameid"));
		

		updateFrameHeight.lastHeight = height;
		
		if(window.updateFrameHeightUserFunction) updateFrameHeightUserFunction();
	  } catch(e) { }
	}
}


function updateFrameHeightAfterInterval()
{
	setTimeout(updateFrameHeight,10);
}


if(!window.addEvent) window.addEvent = function (oTarget, sType, fpDest) {
  var oOldEvent = oTarget[sType];
  if (typeof oOldEvent != "function") {
    oTarget[sType] = fpDest;
  } else {
    oTarget[sType] = function(e) {
      oOldEvent(e);
      fpDest(e);
    }
  }
};

addEvent(window,'onload',updateFrameHeightAfterInterval);
addEvent(document,'onclick',updateFrameHeightAfterInterval);

setTimeout(updateFrameHeight,250);
setInterval(updateFrameHeight,2000);

// roept gedurende 'duration' ms de updateFrameHeight functie aan
function frameHeightUpdater(duration) 
{
    var step = 50;
    var timer = setInterval(function()
    {
        updateFrameHeight();
        duration -= step;
        if(duration < 0) clearInterval(timer);
    }, step);
}