// JavaScript Document
if (document.images)
{
about_on = new Image();
about_on.src = "images/nav_about_on.jpg";
about_off = new Image();
about_off.src = "images/nav_about_off.jpg";

logo_on = new Image();
logo_on.src = "images/nav_logo_on.jpg";
logo_off = new Image();
logo_off.src = "images/nav_logo_off.jpg";

contact_on = new Image();
contact_on.src = "images/nav_contact_on.jpg";
contact_off = new Image();
contact_off.src = "images/nav_contact_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;
   }
 }