/*function resize() {
  var iframe = document.getElementById("mainContent");
   iframe.height=window.frames["mainContent"].document.body.scrollHeight;
  }
*/
function resize() {
			gesamtHoehe=(typeof(window.innerHeight)=='number')?window.innerHeight:document.documentElement.clientHeight; 
			document.getElementById('mainContent').style.height=gesamtHoehe-144+'px'; 
}