function init(){

	//set #main height

	var content = document.getElementById('content');

	var main = document.getElementById('main').style.height = content.offsetHeight + 'px';

}



function addEvent(obj, evType, fn){

 if (obj.addEventListener){

   obj.addEventListener(evType, fn, false);

   return true;

 } else if (obj.attachEvent){

   var r = obj.attachEvent("on"+evType, fn);

   return r;

 } else {

   return false;

 }

}



addEvent(window, 'load', init);