function browserCheck() {
  //
  // Browser Detection. See http://javascript.about.com/library/scripts/blbrowsercheck.htm
  //
  isMac = (navigator.appVersion.indexOf("Mac")!=-1) ? true : false;
  NS4 = (document.layers) ? true : false;
  IEmac = ((document.all)&&(isMac)) ? true : false;
  IE4plus = (document.all) ? true : false;
  IE4 = ((document.all)&&(navigator.appVersion.indexOf("MSIE 4.")!=-1)) ? true : false;
  IE5 = ((document.all)&&(navigator.appVersion.indexOf("MSIE 5.")!=-1)) ? true : false;
  IE6 = ((document.all)&&(navigator.appVersion.indexOf("MSIE 6.")!=-1)) ? true : false;
  ver4 = (NS4 || IE4plus) ? true : false;
  NS6 = (!document.layers) && (navigator.userAgent.indexOf('Netscape')!=-1)?true:false;
  
  IE5plus = IE5 || IE6;
  IEMajor = 0;
  
  if (IE4plus)
  {
  	var start = navigator.appVersion.indexOf("MSIE");
  	var end = navigator.appVersion.indexOf(".",start);
  	IEMajor = parseInt(navigator.appVersion.substring(start+5,end));
  	IE5plus = (IEMajor>=5) ? true : false;
  }
  
  if (NS4)
  	alert('WARNING: This website may not display correctly using Netscape 4 or less. Please update to a later browser version at http://www.netscape.com');
  if (IE4 )
  	alert('WARNING: This website may not display correctly using IE 4 or less. Please update to a later browser version at http://www.microsoft.com/ie');
  //if (isMac)
  //	document.write("<p>You are using a Macintosh</p>");
  //if (IEmac)
  //	document.write("<p>You are using Internet Explorer on Macintosh</p>");
  //if (IE5plus )
  //	document.write("<p>You are using a Internet Explorer version 5.0 or later</p>");
  //if (IE4)
  //	document.write("<p>You are using Internet Explorer 4</p>");
  //if (IE5)
  //	document.write("<p>You are using Internet Explorer 5</p>");
  //if (IE6)
  //	document.write("<p>You are using Internet Explorer 6</p>");
  //if (ver4)
  //	document.write("<p>You are using a version 4.0 or later browser</p>");
  //if (NS6)
  //	document.write("<p>You are using Netscape 6 or later</p>");
  //if (IEMajor>0)
  //	document.write("<p>The IE major version component is "  + IEMajor + "</p>");
}