//preload images
   buttones=new Array();
   buttones_over=new Array();

   for(i=0;i<10;i++){
       buttones[i]=new Image();
       buttones_over[i]=new Image();}

   imagepath="../images/top_buttons/";

   buttones[0].src=imagepath + "home.gif";
   buttones_over[0].src=imagepath + "home_over.gif";

   buttones[1].src=imagepath + "students.gif";
   buttones_over[1].src=imagepath + "students_over.gif";

   buttones[2].src=imagepath + "faculty_disabled.gif"; //"faculty.gif";
   buttones_over[2].src=imagepath + "faculty_disabled.gif"; //"faculty_over.gif";

   buttones[3].src=imagepath + "campus.gif";
   buttones_over[3].src=imagepath + "campus_over.gif";

   buttones[4].src=imagepath + "quick_facts.gif";
   buttones_over[4].src=imagepath + "quick_facts_over.gif";

//menu functions

   function over(item) {
         document.getElementById("btn_img_"+item).src=buttones_over[item].src;
   }
   function out(item) {
         document.getElementById("btn_img_"+item).src=buttones[item].src;
   }
   window.onload = function(){
     var item=2;
     var disabled_img = "../images/top_buttons/" + "faculty_disabled.gif";
     document.getElementById("btn_img_"+item).src=disabled_img;
     /*buttones[item].src=disabled_img;
     buttones_over[item].src=disabled_img;  */
   };