var preload = new Array('images/nav/About_on.gif', 'images/nav/Buying_on.gif', 'images/nav/Selling_on.gif', 'images/nav/fiftyfivePlus_on.gif','images/nav/Remax_on.gif','images/nav/LetsTalk_on.gif');

var loader = new Array();
for(var i = 0; i < preload.length; i++){
   loader[i] = new Image();
   loader[i].src = preload[i];
}