function wbreit(){
	
		if(window.innerWidth){
			var breite = window.innerWidth;
		}else{
			var breite = screen.width;
		}
		if(breite > 1020){
			var abstand = (breite-1020)/2 + 'px';
			document.getElementById('inhalt_site').style.left=abstand;			
		}else{
			
			
		}
		document.getElementById('inhalt_aufbau').style.top='0px';
		
		//alert(breite+" "+window.innerWidth+" "+screen.width);
};
wbreit();