function breite () {
	
	if(screen.width > 1280) {
	
		if (navigator.appName=='Netscape') {
			var x = (window.innerWidth/2)-500;                               
			var y = window.innerHeight;
			var z = (window.innerWidth/2)+500;                          
			
			document.getElementById("ktvam").style.visibility = "visible";
			document.getElementById("ktvam").style.width = x+"px";
			
			document.getElementById("ktvam_right").style.visibility = "visible";
			document.getElementById("ktvam_right").style.width = x+"px";
			document.getElementById("ktvam_right").style.left = z+"px";
			
			document.getElementById("bg").style.height= y+"px";
			document.getElementById("bg2").style.height= y+"px";			
		}
	
		else if (document.all) {  				// IE
			var x = (document.documentElement.clientWidth/2)-500;                               
			var y = document.documentElement.clientHeight;
			var z = (document.documentElement.clientWidth/2)+500; 
						
			document.all("ktvam").style.visibility="visible";
			document.all("ktvam").style.width = x;
			document.all("bg").style.height = y;	
			document.all("ktvam_right").style.visibility="visible";
			document.all("ktvam_right").style.width = x;
			document.all("ktvam_right").style.left = z;	
			document.all("bg2").style.height = y;	
			
				

			
		}
	
		else if(document.getElementByID) {                        // DOM           
			var x = (window.innerWidth/2)-500;                               
			var y = window.innerHeight;			
			document.getElementById("ktvam").style.visibility="visible";
			document.getElementById("ktvam").style.width = x;
			document.getElementById("bg").style.height = y;
		}	
	}
	
	else {
		document.getElementById("ktvam").style.visibility = "hidden";
		document.all("ktvam").style.visibility="hidden";
		document.getElementById("ktvam").style.visibility="hidden";
		document.getElementById("bg").style.visibility = "hidden";
		document.all("bg").style.visibility="hidden";
		document.getElementById("bg").style.visibility="hidden";
		
		document.getElementById("ktvam_right").style.visibility = "hidden";
		document.all("ktvam_right").style.visibility="hidden";
		document.getElementById("ktvam_right").style.visibility="hidden";
	}
}