PfeilOver = new Image(); 
PfeilOver.src = "images/nav/o-pfeil.gif";
PfeilOut = new Image(); 
PfeilOut.src = "images/nav/g-pfeil.gif"; 
function MenuOver(imgName){
 document[imgName].src = PfeilOver.src; 
} 
function MenuOut(imgName){
 document[imgName].src = PfeilOut.src; 
}