// preload images used in menu and toolbar rollovers

if (document.images)
   {
   // menu 

   rodin1 = new Image(175,19);
   rodin1.src = "images/nav/rodin-on.gif";
   rodin2 = new Image(175,19);
   rodin2.src = "images/nav/rodin-off.gif";

   presidency1 = new Image(175,19);
   presidency1.src = "images/nav/presidency-on.gif";
   presidency2 = new Image(175,19);
   presidency2.src = "images/nav/presidency-off.gif";

   center1 = new Image(175,19);
   center1.src = "images/nav/center-on.gif";
   center2 = new Image(175,19);
   center2.src = "images/nav/center-off.gif";

   admin1 = new Image(175,19);
   admin1.src = "images/nav/admin-on.gif";
   admin2 = new Image(175,19);
   admin2.src = "images/nav/admin-off.gif";

   deans1 = new Image(175,19);
   deans1.src = "images/nav/deans-on.gif";
   deans2 = new Image(175,19);
   deans2.src = "images/nav/deans-off.gif";

   history1 = new Image(175,19);
   history1.src = "images/nav/history-on.gif";
   history2 = new Image(175,19);
   history2.src = "images/nav/history-off.gif";

   plan1 = new Image(175,19);
   plan1.src = "images/nav/plan-on.gif";
   plan2 = new Image(175,19);
   plan2.src = "images/nav/plan-off.gif";

   westphilly1 = new Image(175,19);
   westphilly1.src = "images/nav/westphilly-on.gif";
   westphilly2 = new Image(175,19);
   westphilly2.src = "images/nav/westphilly-off.gif";

   streets1 = new Image(175,19);
   streets1.src = "images/nav/streets-on.gif";
   streets2 = new Image(175,19);
   streets2.src = "images/nav/streets-off.gif";

   housing1 = new Image(175,19);
   housing1.src = "images/nav/housing-on.gif";
   housing2 = new Image(175,19);
   housing2.src = "images/nav/housing-off.gif";

   education1 = new Image(175,19);
   education1.src = "images/nav/education-on.gif";
   education2 = new Image(175,19);
   education2.src = "images/nav/education-off.gif";

   economic1 = new Image(175,19);
   economic1.src = "images/nav/economic-on.gif";
   economic2 = new Image(175,19);
   economic2.src = "images/nav/economic-off.gif";

   commercial1 = new Image(175,19);
   commercial1.src = "images/nav/commercial-on.gif";
   commercial2 = new Image(175,19);
   commercial2.src = "images/nav/commercial-off.gif";
   
   pas1 = new Image(175,19);
   pas1.src = "images/nav/pas-on.gif";
   pas2 = new Image(175,19);
   pas2.src = "images/nav/pas-off.gif";
   
   lea1 = new Image(175,19);
   lea1.src = "images/nav/lea-on.gif";
   lea2 = new Image(175,19);
   lea2.src = "images/nav/lea-off.gif";
   
   wpai1 = new Image(175,19);
   wpai1.src = "images/nav/wpai-on.gif";
   wpai2 = new Image(175,19);
   wpai2.src = "images/nav/wpai-off.gif";

   // toolbar

   home1 = new Image(28,23);
   home1.src = "images/toolbar/home1.gif";
   home2 = new Image(28,23);
   home2.src = "images/toolbar/home2.gif";

   az1 = new Image(44,23);
   az1.src = "images/toolbar/az1.gif";
   az2 = new Image(44,23);
   az2.src = "images/toolbar/az2.gif";

   directories1 = new Image(54,23);
   directories1.src = "images/toolbar/directories1.gif";
   directories2 = new Image(54,23);
   directories2.src = "images/toolbar/directories2.gif";

   calendar1 = new Image(45,23);
   calendar1.src = "images/toolbar/calendar1.gif";
   calendar2 = new Image(45,23);
   calendar2.src = "images/toolbar/calendar2.gif";

   maps1 = new Image(27,23);
   maps1.src = "images/toolbar/maps1.gif";
   maps2 = new Image(27,23);
   maps2.src = "images/toolbar/maps2.gif";

   search1 = new Image(33,23);
   search1.src = "images/toolbar/search1.gif";
   search2 = new Image(33,23);
   search2.src = "images/toolbar/search2.gif";

   advanced1 = new Image(72,23);
   advanced1.src = "images/toolbar/advanced1a.gif";
   advanced2 = new Image(72,23);
   advanced2.src = "images/toolbar/advanced2a.gif";
   }

// simple image replacement

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