function Grafik() {

  auswahl = document.forms[0].elements[1].selectedIndex;
  document.images[0].src = document.forms[0].elements[1].options[auswahl].value;
}

/*funktion Navigationsebenen*/
sfHover = function() {
	var sfEls = document.getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);
/*Navigationseben ende--------------------*/