function resize(){
 var height = 0;
 var felder = new Array("content-left", "content-center", "content-right");
 /*var margin_basis = new Array("content-left-menu", "content-center-wrapper", "content-right-contact");
 var margin_in = new Array("content-left-wrapper", "content-center-news", "content-right-wrapper");
 
 // Margins setzen
 for (var i = 0; i < margin_basis.length; i++) {
  boxheight = document.getElementById(margin_basis[i]).offsetHeight;
  
  var x = document.createAttribute("style");
  x.nodeValue = "padding-top: "+boxheight+"px";
  document.getElementById(margin_in[i]).setAttributeNode(x);
 }  */
 
 

 // Lesen + Schreiben Gesammt höhe
 for (var i = 0; i < felder.length; i++) {
  contentheight = document.getElementById(felder[i]).offsetHeight;
  if(contentheight > height)
   height = contentheight;
 }
 if(height != 0)
  for (var i = 0; i < felder.length; i++)
   document.getElementById(felder[i]).style.height = height+"px";
}

function addLoadEvent(func) {
 var oldonload = window.onload;
 if (typeof window.onload != 'function') {
  window.onload = func;
 } else {
  window.onload = function() {
   oldonload();
   func();
  }
 }
}

//addLoadEvent(resize);