// Preload image - incase they are large images.
if(document.images){
  
  var root = "http://www.shs.fau.edu/masterpages/images/";
  
  var main = new Image(); main.src = root + "blank.gif";
  var img1 = new Image(); img1.src = root + "boca.gif";
  var img2 = new Image(); img2.src = root + "dania.gif";
  var img3 = new Image(); img3.src = root + "davie.gif";
  var img4 = new Image(); img4.src = root + "fort.gif";
  var img5 = new Image(); img5.src = root + "harbor.gif";
  var img6 = new Image(); img6.src = root + "jupiter.gif";
  var img7 = new Image(); img7.src = root + "treasure.gif";
}

function change(imageName){
  if(document.images){ document['main'].src = eval(imageName + ".src"); }
}

function changeBack(){
  if(document.images){ document['main'].src = main.src; }
}