// JavaScript browser, is present
  var browserOK = false;
  var pics;
 
  browserOK = true;
  pics = new Array();
  
  var objCount = 0; // number of (changing) images on web-page

function preload(name, first, second) {  

  // preload images and place them in an array
  if (browserOK) {     
    pics[objCount] = new Array(3);
    pics[objCount][0] = new Image();
    pics[objCount][0].src = first;
    pics[objCount][1] = new Image();
    pics[objCount][1].src = second;
    pics[objCount][2] = name;
    objCount++;
  }
}

function on(name){
  if (browserOK) {
     for (i = 0; i < objCount; i++) {
      if (document.images[pics[i][2]] != null)
        if (name != pics[i][2]) { 

          // set back all other pictures
          document.images[pics[i][2]].src = pics[i][0].src;
        } else {

           // show the second image because cursor moves across this image
           document.images[pics[i][2]].src = pics[i][1].src;
        }
    }
  }
}

function off(){
  if (browserOK) {
     for (i = 0; i < objCount; i++) {

      // set back all pictures
      if (document.images[pics[i][2]] != null) 
        document.images[pics[i][2]].src = pics[i][0].src;
    }
  }
}
	preload("phonebook", "http://www.ndsu.edu/images/bs.phonebook.gif", "http://www.ndsu.edu/images/bs.phonebook.over.gif");
	preload("campusmap", "http://www.ndsu.edu/images/bs.campusmap.gif", "http://www.ndsu.edu/images/bs.campusmap.over.gif");
	preload("prospective", "http://www.ndsu.edu/images/buttons/bs.prospective.gif", "http://www.ndsu.edu/images/buttons/bs.prospective.over.gif");
	preload("admitted", "http://www.ndsu.edu/images/buttons/bs.admitted.gif", "http://www.ndsu.edu/images/buttons/bs.admitted.over.gif");
	preload("undergraduate", "http://www.ndsu.edu/images/buttons/bs.undergraduate.gif", "http://www.ndsu.edu/images/buttons/bs.undergraduate.over.gif");
	preload("graduate", "http://www.ndsu.edu/images/buttons/bs.graduate.gif", "http://www.ndsu.edu/images/buttons/bs.graduate.over.gif");
	preload("alumni_friends", "http://www.ndsu.edu/images/buttons/bs.alumni_friends.gif", "http://www.ndsu.edu/images/buttons/bs.alumni_friends.over.gif");
	preload("faculty_staff", "http://www.ndsu.edu/images/buttons/bs.faculty_staff.gif", "http://www.ndsu.edu/images/buttons/bs.faculty_staff.over.gif");