function dheight(){
	try{
		var heightmain = document.getElementById('main').offsetHeight;
		var heightnav = document.getElementById('nav').offsetHeight;
		heightmain = parseInt(heightmain);
		heightnav = parseInt(heightnav);
		temp = 0;
		if(heightnav<=heightmain){
			temp = heightmain%215;
			temp = 215-temp;
			heightmain = heightmain+temp;
			document.getElementById('nav').style.height=heightmain+"px";
			document.getElementById('main').style.height=heightmain+"px";
		}else{
			temp = heightnav%215;
			temp = 215-temp;
			heightnav = heightnav+temp;
			document.getElementById('main').style.height=heightnav+"px";
			document.getElementById('nav').style.height=heightnav+"px";
		}
	}catch(ex){
		fehler = "";
		for (myelement in ex)fehler += myelement + " : " + ex[myelement] + " ";
		alert(fehler);
	}
}