// Detect if browser is Netscape 3 + or IE 4 +.
bName = navigator.appName;
bVer = parseInt(navigator.appVersion);
    if ((bName == "Netscape" && bVer >= 3) || 
        (bName == "Microsoft Internet Explorer" && bVer >= 4)) br = "n3"; 
    else br = "n2";

// Create image objects, preload all active and inactive images.
    if (br== "n3") { 
    watchtenon = new Image();         
    watchtenon.src = "images/watchten_on.gif"; 
	traileron = new Image();
    traileron.src = "images/trailer_on.gif";
	scheduleson = new Image();
    scheduleson.src = "images/schedules_on.gif";
   

// roll off images
    watchtenoff = new Image();          	 
    watchtenoff.src = "images/watchten_off.gif";
	traileroff = new Image();
    traileroff.src = "images/trailer_off.gif";
	schedulesoff = new Image();
    schedulesoff.src = "images/schedules_off.gif";  
    
}

// Function to "activate" images.
function imgAct(imgName) {
    if (br == "n3") {
    document[imgName].src = eval(imgName + "on.src");
    }
}

// Function to "deactivate" images.
function imgInact(imgName) {
    if (br == "n3") {
    document[imgName].src = eval(imgName + "off.src");
    }
}