if (document.images) {
            img1on = new Image();
            img1on.src = "images/home/door-abyss.jpg";
            img1off = new Image();
            img1off.src = "images/home/door-to-the-abyss-02b.jpg"; 

}
function imgOn(imgName) {
if (document.images) {
document[imgName].src = eval(imgName + "on.src");}
}
function imgOff(imgName) {
if (document.images) {
document[imgName].src = eval(imgName + "off.src");}
}