function changepic(layer,z)
	{
		document.getElementById(layer).style.zIndex=z
	}

function fenster(datei,name,w,h)   
	{
		window.open(datei,name,"width="+w+",height="+h+",toolbar=no,menubar=no,scrollbars=yes,resizable=yes,location=no,directories=no,status=no");
	}
	
function hauptfoto(a,b,c,zahl,seite)
	{
		// Let "zahl" be the number of possible photos that can be used.
		//
		// Let "a", "b", and "c" be the heights of photos 1, 2, and 3, respectively.
		// If there's less than 3 photos, let the unused variables equal 0. They can't be empty!
		// If you desire to add more photos, you just have to add more variables (d,e,etc...).
		var r = Math.floor(zahl*(Math.random()))+1;
		if (r==1)
			{
				document.getElementById("hauptfoto").height=a;
				document.getElementById("hauptfotocell").style.backgroundPosition="0px "+a+"px";
			}
		if (r==2)
			{
				document.getElementById("hauptfoto").height=b;
				document.getElementById("hauptfotocell").style.backgroundPosition="0px "+b+"px";
			}
		if (r==3)
			{
				document.getElementById("hauptfoto").height=c;
				document.getElementById("hauptfotocell").style.backgroundPosition="0px "+c+"px";
			}
		document.getElementById("hauptfoto").src=seite+"_Images/"+seite+"_hauptfoto"+r+".jpg";
	}