function fixHeight (els) {
// height of viewport
  var y;
  y = Math.max(document.body.scrollHeight, 
               document.body.offsetHeight, 
               document.documentElement.scrollHeight);  
  
  for (var i=0;i<els.length;i++) {
  	eH = els[i].offsetHeight;
	y = Math.max(eH,y);
  }
  
  for (i=0;i<els.length;i++) {
  	els[i].style.height = y + 'px';
  }
}
function $(id){
	return document.getElementById(id);
}
function onloadFunc(){
	fixHeight([document.getElementById('holder')]); // element ID needs to be customised for each website
}
addEvent(window, 'load', onloadFunc);