var outImgHash = new Array();
var overImgHash = new Array();

function navi_preload()
{
var j=0;
for (x=0; x < document.images.length; x++){
		if(document.images[x].name.substr(0,4) == 'nav_'){
			var quelle = document.images[x].src;
			var quelle_active = quelle.replace(/(\.[^\.]+)$/, "_act$1");
			outImgHash[document.images[x].name] = new Image();
			outImgHash[document.images[x].name].src = quelle;
			overImgHash[document.images[x].name] = new Image();
			overImgHash[document.images[x].name].src = quelle_active;
		}
	}
}

function navi_act(bildname) {
	if(document.getElementsByName(bildname)[0]){
		if(overImgHash[bildname]){
			document.getElementsByName(bildname)[0].src = overImgHash[bildname].src;
		}
	}
	else{
		for (a=0; a < document.images.length; a++){
			if (document.images[a].name == bildname && (document.images[a].src.search(/_act\.[^\.]+$/) < 0)){
				var quelle = document.images[a].src;
				var quelle_active = quelle.substring(0,quelle.lastIndexOf(".")) + "_act" + quelle.substring(quelle.lastIndexOf("."),quelle.length);
				document.images[a].src =  quelle_active;
				break;
			}
		}
	}
}

function navi_normal(bildname) {
	if(document.getElementsByName(bildname)[0]){
		if(outImgHash[bildname]){
			document.getElementsByName(bildname)[0].src = outImgHash[bildname].src;
		}
	}
	else{
		for (b=0; b < document.images.length; b++){
			if (document.images[b].name == bildname){
				var quelle = document.images[b].src;
				var minus_act = quelle.lastIndexOf(".") - 4;
				var quelle_normal = quelle.substring(0,minus_act) + quelle.substring(quelle.lastIndexOf("."),quelle.length);
				document.images[b].src =  quelle_normal;
				break;
			}
		}
	}
}

function show(zoom_layer){
	zoom_layer.style.visibility = 'visible';
	var yOffset = window.pageYOffset || document.body.scrollTop;
	zoom_layer.style.top = yOffset;
}

function change_visibility(layer, value){
	layer.style.visibility = value;
}

//###########################STINER#################################

function show_layer (id) {
	var l = document.getElementById(id);
	if ( l!= null ) {
		l.style.display = "block";
		}
	}
	
function hide_layer (id) {
	var l = document.getElementById(id);
	if ( l!= null ) {
		l.style.display = "none";
		}
	}