NS4=(document.layers) ;
NS60=(navigator.userAgent.indexOf("Netscape6/6.0")!=-1);
Opera=(navigator.userAgent.indexOf('Opera')!=-1)||(navigator.appName.indexOf('Opera')!=-1)||(window.opera);
IE4=(document.all&&!Opera) ;
mac=((IE4)&&(navigator.appVersion.indexOf ("Mac")!=-1));
DOM=document.documentElement&&!NS4&&!IE4&&!Opera;
mswnd=(navigator.appVersion.indexOf("Windows")!=-1||navigator.appVersion.indexOf("WinNT")!=-1);

if(IE4)
	{
	av=navigator.appVersion;
	avi=av.indexOf("MSIE");
	if (avi==-1)
		version = parseInt (av) ;
	  else
		version = parseInt(av.substr(avi+4)) ;
	}