function changeHight() {
	
	var leftside = document.getElementById('lowercontent').offsetHeight + 0;
	var rightside = document.getElementById('rightside').offsetHeight + 40;
	var windowheigth = window.innerHeight - 324;
	
	var newheight = 0;
	
	if(windowheigth > rightside && windowheigth > leftside) {
		
		newheight = windowheigth-344;
	}else {
		
		if(rightside > leftside) {
			
			newheight = rightside;
		}else {
			
			newheight = leftside;
		}
	}
	
	
	var obj = document.getElementById("rightside");
	if(!obj)  alert('rightside existiert nicht');
	if(!obj.style)  alert('Das style existiert nicht'); 
						 
	var obj2 = document.getElementById("lowercontent");
	if(!obj2)  alert('content existiert nicht');
	if(!obj2.style)  alert('Das style existiert nicht'); 
	
	var obj3 = document.getElementById("leftside");
	if(!obj3)  alert('content existiert nicht');
	if(!obj3.style)  alert('Das style existiert nicht');
	
	var browserName=navigator.appName; 
 
 var lowerheight = newheight+30;
 
	if (browserName=="Microsoft Internet Explorer")	{
		
		document.getElementById('lowercontent').style.setAttribute("height", lowerheight+"px !IMPORTANT;", false);
		document.getElementById('rightside').style.setAttribute("height", newheight+"px !IMPORTANT;", false);
		document.getElementById('leftside').style.setAttribute("height", newheight+"px !IMPORTANT;", false);

	}else	{
		
		document.getElementById('lowercontent').style.height = lowerheight+"px";
		document.getElementById('rightside').style.height = newheight+"px";
		document.getElementById('leftside').style.height = newheight+"px";
	}
	
	
	
	

}