function changeTo(GraphicToChange, GraphicToShow) {
   if (document.images) {document[GraphicToChange].src = GraphicToShow; }   }

  function bar(message) { 
   if (document.images) { window.status = message; return true }   }

var loaded = false;

if (document.images) {
     nav1a  = new Image();nav1a.src  = "images/nav1a.gif";
     nav1b  = new Image();nav1b.src  = "images/nav1b.gif";
     nav2a  = new Image();nav2a.src  = "images/nav2a.gif";
     nav2b  = new Image();nav2b.src  = "images/nav2b.gif";
     nav3a  = new Image();nav3a.src  = "images/nav3a.gif";
     nav3b  = new Image();nav3b.src  = "images/nav3b.gif";
     nav4a  = new Image();nav4a.src  = "images/nav4a.gif";
     nav4b  = new Image();nav4b.src  = "images/nav4b.gif";
     nav5a  = new Image();nav5a.src  = "images/nav5a.gif";
     nav5b  = new Image();nav5b.src  = "images/nav5b.gif";
     nav6a  = new Image();nav6a.src  = "images/nav6a.gif";
     nav6b  = new Image();nav6b.src  = "images/nav6b.gif";
     nav7a  = new Image();nav7a.src  = "images/nav7a.gif";
     nav7b  = new Image();nav7b.src  = "images/nav7b.gif";
}


function imageLoad() {
    if (document.images) {
     nav1a  = new Image();nav1a.src  = "images/nav1a.gif";
     nav1b  = new Image();nav1b.src  = "images/nav1b.gif";
     nav2a  = new Image();nav2a.src  = "images/nav2a.gif";
     nav2b  = new Image();nav2b.src  = "images/nav2b.gif";
     nav3a  = new Image();nav3a.src  = "images/nav3a.gif";
     nav3b  = new Image();nav3b.src  = "images/nav3b.gif";
     nav4a  = new Image();nav4a.src  = "images/nav4a.gif";
     nav4b  = new Image();nav4b.src  = "images/nav4b.gif";
     nav5a  = new Image();nav5a.src  = "images/nav5a.gif";
     nav5b  = new Image();nav5b.src  = "images/nav5b.gif";
     nav6a  = new Image();nav6a.src  = "images/nav6a.gif";
     nav6b  = new Image();nav6b.src  = "images/nav6b.gif";
     nav7a  = new Image();nav7a.src  = "images/nav7a.gif";
     nav7b  = new Image();nav7b.src  = "images/nav7b.gif";
    }
}