var myWindow;

function openCenteredWindow(url) {
    var width = 900;
    var height = 600;
    var left = parseInt((screen.availWidth/2) - (width/2));
    var top = parseInt((screen.availHeight/2) - (height/2));
    var windowFeatures = "width=" + width + ",height=" + height + "status=yes,toolbar=no,menubar=no,location=no,left=" + left + ",top=" + top + "screenX=" + left + ",screenY=" + top;
    myWindow = window.open(url, "subWind", windowFeatures);  
}

function logooff() {
    document.images.logo.src = 'images/showroom-v2/blank-logo.gif';
}

function logoon(logo_name) {
    document.images.logo.src = 'images/showroom-v2/' + logo_name + '-logo.gif'; 
}

function rolloff(obj) {
    obj.src = obj.src.replace('-over.jpg','.jpg');
}

function rollon(obj) {
    obj.src = obj.src.replace('.jpg','-over.jpg');
}

function rollout(obj, img) {
img = img || "gif";
    obj.src = obj.src.replace('-over.'+img,'.'+img);
}

function rollover(obj, img) {
img = img || "gif";
    obj.src = obj.src.replace('.'+img,'-over.'+img);
}