function delayedHidePreloader() {
    var agt = navigator.userAgent.toLowerCase();
    var is_major = parseInt(navigator.appVersion);
    var is_mac = (agt.indexOf("mac") != -1);
    is_netscape = (document.layers)? true:false
    var is_ie = (agt.indexOf("msie") != -1);
    if(is_ie) {
	if (typeof(preloader)!='undefined')
	preloader.style.visibility = "hidden";
	}
    else if(is_netscape) {
    for(i=0;i<document.layers.length;i++)
        if(document.layers[i].name == "preloader")
        document.layers[i].visibility = 'HIDE';
    }
    else document.getElementById("preloader").style.visibility = "hidden";
}

function hidePreloader() {
    window.setTimeout("delayedHidePreloader()", 1000);
    window.setTimeout("delayedHidePreloader()", 4000);
}

function showPreloader() {
    var agt = navigator.userAgent.toLowerCase();
    var is_major = parseInt(navigator.appVersion);
    var is_mac = (agt.indexOf("mac") != -1);
    is_netscape = (document.layers)? true:false
    var is_ie = (agt.indexOf("msie") != -1);
    if(is_ie) preloader.style.visibility = "visible";
    else if(is_netscape) {
    for(i=0;i<document.layers.length;i++)
        if(document.layers[i].name == "preloader")
        document.layers[i].visibility = 'SHOW';
    }
    else document.getElementById("preloader").style.visibility = "visible";
}