if (document.images)
{
why_on = new Image();
why_on.src = "images/button_why_on.jpg";
why_off = new Image();
why_off.src = "images/button_why_off.jpg";

faqs_on = new Image();
faqs_on.src = "images/button_faqs_on.jpg";
faqs_off = new Image();
faqs_off.src = "images/button_faqs_off.jpg";

who_on = new Image();
who_on.src = "images/button_who_on.jpg";
who_off = new Image();
who_off.src = "images/button_who_off.jpg";

}

 function rollOn(imgName)
 {
   if (document.images) {
    imgOn = eval(imgName + "_on.src");
    document [imgName].src = imgOn;
   }
 }

 function rollOff(imgName)
 {
   if (document.images) {
    imgOff = eval(imgName + "_off.src");
    document [imgName].src = imgOff;
   }
 }
 
 function goto_URL(object) {
    window.location.href = object.options[object.selectedIndex].value;
}