image1 = new Image();
image1.src = "images/hemen.gif";
image1on = new Image();
image1on.src = "images/hemen_over.gif";


imageStay = ""

function imageon(name){
        if (imageStay != name){
                document[name].src = eval(name + "on.src");
        }
}

function imageoff(name){
        if (imageStay != name){
                document[name].src = eval(name + ".src");
        }
}

function on(name){
        imageon(name);
}

function off(name){
        imageoff(name);
}

function stay(name){
        document[name].src = eval(name + "stay.src");
        if (imageStay != name){
                if (imageStay != ""){
                        document[imageStay].src = eval(imageStay + ".src");
                }
        }
        imageStay = name
}