function show_layer(id) {
	if(document.all) { 
		document.all[id].style.visibility = "visible";
		}
	else {
		document.getElementById(id).style.visibility = "visible";
		}
	}
	
function hide_layer(id) {
	if(document.all) { 
		document.all[id].style.visibility = "hidden";
		}
	else {
		document.getElementById(id).style.visibility = "hidden";
		}
	}
	
function plan() {
	var win = window.open("karte.php","karte","top=100,left=100,height=600,width=860,scrollbars=yes,resizable=yes");
	win.focus();
	}
	
function slide(img_name) {
	var win = window.open("slide.php?img="+img_name,"slide","top=100,left=300,height=250,width=350,scrollbars=no,resizable=no,status=no,toolbar=no");
	win.focus();
	}