ns = (document.layers) ? 1 : 0;
ie = (document.all) ? 1 : 0;
ns6 = (document.getElementById) ? 1 : 0;
function changeImages() {
	if (document.images ) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var letztes_bild;

function show_layer(x)
{
	if(ns) { document.layers[x].visibility="show"; } else if (ie) {	document.all[x].style.visibility="visible";	} else {document.getElementById(x).style.visibility="visible";}
}
function hide_layer(x)
{
	if(ns) {document.layers[x].visibility="hide";} else if (ie) {document.all[x].style.visibility="hidden";}else {document.getElementById(x).style.visibility="hidden";}
}