imageArray = new Array();
current = "";
function load_img(name_src)
{
   if(document.images) {
     var temp = imageArray[name_src];
      if(! temp) {
      temp = new Image();
      temp.src = name_src;
      imageArray[name_src] = temp;
      }

   return temp;
}
 
}
function replace_img(name, name_src)
  {    
    if(document.images) {
      if(name != current) {
        document[name].src = load_img(name_src).src;
     }
  }
}


load_img("images/about_over.gif");
load_img("images/undergrad_over.gif");
load_img("images/grad_over.gif");
load_img("images/courses_over.gif");
load_img("images/faculty_over.gif");
load_img("images/current_over.gif");