function bw_check() {
var x=navigator.userAgent;
this.op=(x.indexOf("Opera")!=-1);
this.ie=(x.indexOf("MSIE")!=-1 && !this.op);
this.ns=(!document.all )?true:false;
this.dom=document.getElementById?true:false;
this.ns6=(this.ns&&this.dom)?true:false;
this.ns4=document.layers?true:false;
return this;
}
bw=new bw_check();