if (document.images) {
Image1on = new Image();          Image1on.src = "imagesforum/menu1-on.gif";
Image2on = new Image();          Image2on.src = "imagesforum/menu2-on.gif";
Image3on = new Image();          Image3on.src = "imagesforum/menu3-on.gif";
Image4on = new Image();          Image4on.src = "imagesforum/menu4-on.gif";
Image5on = new Image();          Image5on.src = "imagesforum/contactanos-on.gif";
Image6on = new Image();          Image6on.src = "imagesforum/sub1-on.gif";
Image7on = new Image();          Image7on.src = "ann/foro-on.gif";
Image8on = new Image();          Image8on.src = "ann/chat-on.gif";

Image1off = new Image();         Image1off.src = "imagesforum/menu1.gif ";
Image2off = new Image();         Image2off.src = "imagesforum/menu2.gif";
Image3off = new Image();         Image3off.src = "imagesforum/menu3.gif";
Image4off = new Image();         Image4off.src = "imagesforum/menu4.gif";
Image5off = new Image();         Image5off.src = "imagesforum/contactanos.gif";
Image6off = new Image();         Image6off.src = "imagesforum/sub1.gif";
Image7off = new Image();         Image7off.src = "ann/foro.gif";
Image8off = new Image();         Image8off.src = "ann/chat.gif";

}

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