function lib_bwcheck(){ 
  this.ver=navigator.appVersion
  this.agent=navigator.userAgent
  this.name=navigator.appName
  this.dom=document.getElementById?1:0
  this.opera5=this.agent.indexOf("Opera 5")>-1
  this.opera=this.agent.indexOf("Opera")>-1
  this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0; 
  this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera5)?1:0;
  this.ie7=(this.ver.indexOf("MSIE 7")>-1 && this.dom && !this.opera5)?1:0;
  this.ie4=(document.all && !this.dom && !this.opera5)?1:0;
  this.ie=this.ie4||this.ie5||this.ie6
  this.mac=this.agent.indexOf("Mac")>-1
  this.ff=this.agent.indexOf("Firefox")>-1
  this.ns6=(this.dom && parseInt(this.ver) >= 5) ?1:0; 
  //this.ns4=(document.layers && !this.dom)?1:0; // Original by Bratta
  this.ns4=(this.name== "Netscape" && parseInt(navigator.appVersion)==4)?1:0;
  if (this.ns4){
	this.ns4old=(navigator.appVersion.substring (2,3)=="0")?1:0;
	}
  this.bw=(this.ie7||this.ie6||this.ie5||this.ie4||this.ns4||this.ns6||this.opera5||this.opera||this.dom)
  return this
}


bw = new lib_bwcheck()