function mnuOver(obj){
var url = new String(obj.src);
if(!(url.match(/_selected\.jpg$/))){
obj.src = url.replace(/\.jpg/, '_mouseover.jpg');
}
}

function mnuOut(obj){
var url = new String(obj.src);
if(!(url.match(/_selected\.jpg$/))){
obj.src = url.replace(/_mouseover\.jpg/, '.jpg');
}
}