function changePic(BildBez,BildId,layerName,aktion,frame) {
	var vvorspann = "";
	var vlayer = "";
	if (frame) {
		var vvorspann = "top.main." + frame + ".";
		var frameOk = eval("top.main."+frame);
	} else {frameOk = true;}
	if (layerName) {
		var vlayer = "layers['"+layerName+"'].document.";
	}
	if (document.images && frameOk) {
		if (document.layers) {
				if (eval(vvorspann + "document."+vlayer+BildId)) {
					eval(vvorspann + "document."+vlayer+BildId+".src="+BildBez+"_"+aktion+".src");
				}
		}
		else {
			if (eval(vvorspann + "document."+BildId)) {
				eval(vvorspann + "document."+BildId+".src="+BildBez+"_"+aktion+".src");	
			}
		}
	}
}