browser = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )))

if (document.images) {
  
auto_on = new Image();
auto_on.src = "images/auto_on.gif";
auto_off = new Image();
auto_off.src = "images/auto_off.gif";
home_on = new Image();
home_on.src = "images/home_on.gif";
home_off = new Image();
home_off.src = "images/home_off.gif";   
commercial_on = new Image();
commercial_on.src = "images/commercial_on.gif";
commercial_off = new Image();
commercial_off.src = "images/commercial_off.gif";
boat_on = new Image();
boat_on.src = "images/boat_on.gif";
boat_off = new Image();
boat_off.src = "images/boat_off.gif";
motorcycle_on = new Image();
motorcycle_on.src = "images/motorcycle_on.gif";
motorcycle_off = new Image();
motorcycle_off.src = "images/motorcycle_off.gif";
health_on = new Image();
health_on.src = "images/health_on.gif";
health_off = new Image();
health_off.src = "images/health_off.gif";
life_on = new Image();
life_on.src = "images/life_on.gif";
life_off = new Image();
life_off.src = "images/life_off.gif";
}
function rollover(imgDocID,imgObjName) {
if ( browser) {
        document.images[imgDocID].src = eval(imgObjName + ".src")
        }
}