var display_clouds = true;
if (navigator.appVersion.indexOf("X11")!==-1) {    
    display_clouds = false;
}
if(navigator.appVersion.indexOf("Mac")!=-1 && Prototype.Browser.Gecko) {
    display_clouds = false;
}
if(display_clouds) {
    var FO = { movie:"/swf/clouds.swf", width:"100%", height:"100%", majorversion:"8", build:"0", wmode:"transparent" };
    UFO.create(FO, "outer-container");
}