function dhBw(){ 
		this.name = navigator.appName;
		this.version = navigator.appVersion;
		this.dom=document.getElementById?1:0
		this.opera5=(this.name.indexOf("Opera") > -1 && (this.dom))?1:0
		this.ie4=(document.all && !this.dom)?1:0
		this.ie5=(this.dom && this.version.indexOf("MSIE ") > -1)?1:0
		this.ns4=(document.layers && !this.dom)?1:0 
		this.ns6=(this.dom && this.version.indexOf("MSIE ") == -1)?1:0
		this.bw=(this.ie4||this.ie5||this.ns4||this.ns6||this.opera5)
		eval ("bt=this");
	}

	var bw = new dhBw();