// preload images used in menu and toolbar rollovers

if (document.images)
   {
   // menu 

  linka = new Image(175,19);
   linka.src = "http://www.upenn.edu/research/images/menu/linka.gif";
   linka1 = new Image(175,19);
   linka1.src = "http://www.upenn.edu/research/images/menu/linka1.gif";

   linkb = new Image(175,19);
   linkb.src = "http://www.upenn.edu/research/images/menu/linkb.gif";
   linkb1 = new Image(175,19);
   linkb1.src = "http://www.upenn.edu/research/images/menu/linkb1.gif";

  linkc = new Image(175,19);
   linkc.src = "http://www.upenn.edu/research/images/menu/linkc.gif";
   linkc1 = new Image(175,19);
   linkc1.src = "http://www.upenn.edu/research/images/menu/linkc1.gif";

  linkd = new Image(175,19);
   linkd.src = "http://www.upenn.edu/research/images/menu/linkd.gif";
   linkd1 = new Image(175,19);
   linkd1.src = "http://www.upenn.edu/research/images/menu/linkd1.gif";

   linke = new Image(175,19);
   linke.src = "http://www.upenn.edu/research/images/menu/linke.gif";
   linke1 = new Image(175,19);
   linke1.src = "http://www.upenn.edu/research/images/menu/linke1.gif";
   
    linkf = new Image(175,19);
   linkf.src = "http://www.upenn.edu/research/images/menu/linkf.gif";
   linkf1 = new Image(175,19);
   linkf1.src = "http://www.upenn.edu/research/images/menu/linkf1.gif";
   
    linkg = new Image(175,19);
   linkg.src = "http://www.upenn.edu/research/images/menu/linkg.gif";
   linkg1 = new Image(175,19);
   linkg1.src = "http://www.upenn.edu/research/images/menu/linkg1.gif";
   
     linkh = new Image(175,19);
   linkh.src = "http://www.upenn.edu/research/images/menu/linkh.gif";
   linkh1 = new Image(175,19);
   linkh1.src = "http://www.upenn.edu/research/images/menu/linkh1.gif";
   
     linki = new Image(175,19);
   linki.src = "http://www.upenn.edu/research/images/menu/linki.gif";
   linki1 = new Image(175,19);
   linki1.src = "http://www.upenn.edu/research/images/menu/linki1.gif";

     linkj = new Image(175,38);
   linkj.src = "http://www.upenn.edu/research/images/menu/linkj.gif";
   linkj1 = new Image(175,38);
   linkj1.src = "http://www.upenn.edu/research/images/menu/linkj1.gif";
   
    linkk = new Image(175,38);
   linkk.src = "http://www.upenn.edu/research/images/menu/linkk.gif";
   linkk1 = new Image(175,38);
   linkk1.src = "http://www.upenn.edu/research/images/menu/linkk1.gif";
 

   // toolbar

   home1 = new Image(28,23);
   home1.src = "http://www.upenn.edu/research/images/toolbar/home1.gif";
   home2 = new Image(28,23);
   home2.src = "http://www.upenn.edu/research/images/toolbar/home2.gif";

   az1 = new Image(44,23);
   az1.src = "http://www.upenn.edu/research/images/toolbar/az1.gif";
   az2 = new Image(44,23);
   az2.src = "http://www.upenn.edu/research/images/toolbar/az2.gif";

   directories1 = new Image(54,23);
   directories1.src = "http://www.upenn.edu/research/images/toolbar/directories1.gif";
   directories2 = new Image(54,23);
   directories2.src = "http://www.upenn.edu/research/images/toolbar/directories2.gif";

   calendar1 = new Image(45,23);
   calendar1.src = "http://www.upenn.edu/research/images/toolbar/calendar1.gif";
   calendar2 = new Image(45,23);
   calendar2.src = "http://www.upenn.edu/research/images/toolbar/calendar2.gif";

   maps1 = new Image(27,23);
   maps1.src = "http://www.upenn.edu/research/images/toolbar/maps1.gif";
   maps2 = new Image(27,23);
   maps2.src = "http://www.upenn.edu/research/images/toolbar/maps2.gif";

   search1 = new Image(33,23);
   search1.src = "http://www.upenn.edu/research/images/toolbar/search1.gif";
   search2 = new Image(33,23);
   search2.src = "http://www.upenn.edu/research/images/toolbar/search2.gif";

   advanced1 = new Image(72,23);
   advanced1.src = "http://www.upenn.edu/research/images/toolbar/advanced1a.gif";
   advanced2 = new Image(72,23);
   advanced2.src = "http://www.upenn.edu/research/images/toolbar/advanced2a.gif";
   }

// simple image replacement

function imgSwap(imgDocID,imgObjName)
   {
   if (document.images)
      {
      document.images[imgDocID].src = eval(imgObjName + ".src")
      }
   }