function yg_Browser(){
            d=document; this.agt=navigator.userAgent.toLowerCase(); this.major=parseInt(navigator.appVersion);
            this.dom=(d.getElementById);
            this.ns=(d.layers);
            this.ns4up=(this.ns && this.major>=4); this.ns6=(this.dom&&navigator.appName=="Netscape");
            this.op=(window.opera);
            if(d.all)this.ie=1;else this.ie=0;
            this.ie4=(d.all&&!this.dom);
            this.ie4up=(this.ie&&this.major>=4);
            this.ie5=(d.all&&this.dom);
            this.ie6=(d.nodeType);
            this.sf=(this.agt.indexOf("safari")!=-1); this.win=((this.agt.indexOf("win")!=-1)||(this.agt.indexOf("16bit")!=-1));
            this.winme=(this.agt.indexOf("win 9x 4.90")!=-1); this.xpsp2=(this.agt.indexOf("sv1")!=-1); this.mac=(this.agt.indexOf("mac")!=-1);
        }
        oBw = new yg_Browser();
    	var ie4 = (document.all) ? true : false;
	    var ns4 = (document.layers) ? true : false;
    	var ns6 = (document.getElementById && !document.all) ? true : false;
	    function hidelayer(lay) {
        	if (ie4) {document.all[lay].style.visibility = "hidden";}
        	if (ns4) {document.layers[lay].visibility = "hide";}
        	if (ns6) {document.getElementById([lay]).style.display = "none";}
	    }
    	function showlayer(lay) {
	        if (ie4) {document.all[lay].style.visibility = "visible";}
        	if (ns4) {document.layers[lay].visibility = "show";}
        	if (ns6) {document.getElementById([lay]).style.display = "block";}
	    }