function changeMenuButton(e){
var sourceelement;
if (e.srcElement) sourceelement = e.srcElement;
else sourceelement = e.target;
//alert (sourceelement.src);
//var elementimage = sourceelement.src;
if (sourceelement.src.search("_akt.gif") > -1) sourceelement.src = sourceelement.src.replace(/_akt.gif/,".gif");
else sourceelement.src = sourceelement.src.replace(/.gif/,"_akt.gif");
}