function changeImage(imgName, imgSrc)
{
    document.images[imgName].src = imgSrc;
}


// create an array of the URLs of all images that are to 
// appear in the rollovers

var imgs = new Array("images_botnav/navbot_home.jpg","images_botnav/currentnavbot_home.jpg","images_botnav/hovernavbot_home.jpg","images_botnav/navbot_bob.jpg","images_botnav/currentnavbot_bob.jpg","images_botnav/hovernavbot_bob.jpg","images_botnav/navbot_heroes.jpg","images_botnav/currentnavbot_heroes.jpg","images_botnav/hovernavbot_heroes.jpg","images_botnav/navbot_about.jpg","images_botnav/currentnavbot_about.jpg","images_botnav/hovernavbot_about.jpg","images_botnav/navtop_partners.jpg","images_botnav/currenttop_partners.jpg","images_botnav/hovertop_partners.jpg","images_botnav/navtop_donations.jpg","images_botnav/currentnavbot_donations.jpg","images_botnav/hovernavbot_donations.jpg","iimages_botnav/navbot_gallery.jpg","images_botnav/currentnavbot_gallery.jpg","images_botnav/hovernavbot_gallery.jpg","images_botnav/navbot_contact.jpg","images_botnav/currentnavbot_contact.jpg","images_botnav/hovernavbot_contact.jpg","images_botnav/navbot_nominations.jpg","images_botnav/currentnavbot_nominations.jpg","images_botnav/hovernavbot_nominations.jpg");

// create a new empty array

var preload = new Array();

// insert a new Image object into each empty element
// then assign each image URL to the Image objects  

for(var i = 0; i < imgs.length; i++ )
{
  preload[ i ] = new Image();
  preload[ i ].src = imgs[i];
}