function out(obj){
    if (obj.className=='selected'){
        obj.style.backgroundImage='url(http://www.fitnessking.be/images/main-menu-bg-over.gif)';
    }
    else{
        obj.style.backgroundImage='url(http://www.fitnessking.be/images/main-menu-bg-out.gif)';
    }
}
function over(obj){
    obj.style.backgroundImage='url(http://www.fitnessking.be/images/main-menu-bg-over.gif)';
}