function BrowserID() {
	var browserString = navigator.appName;
	var versionString = navigator.appVersion;

	if ( browserString == "Netscape" ){
		this.browser = "ns";
	}
	else if ( browserString == "Microsoft Internet Explorer" ){
		this.browser = "ie";
		//get the true version - often not true to the number at the beginning of the string
		versionString = versionString.substr( versionString.indexOf("MSIE") + 5, 4 )
	}
	else { 
		this.browser = browserString;
	}

	this.version = parseInt( versionString );

	var platform = navigator.platform;
	this.isMac = ( platform == "MacPPC" );
	this.isPC = ( !this.isMac );

	this.isIE = ( this.browser == "ie" && this.version >= 4 );
	this.isIE4 = ( this.browser == "ie" && this.version == 4 );
	this.isIE5 = ( this.browser == "ie" && this.version == 5 );

	this.isNS = ( this.browser == "ns" && this.version >= 4 );
	this.isNS4 = ( this.browser == "ns" && this.version == 4 );
	this.isNS5 = ( this.browser == "ns" && this.version == 5 );
}
curSystem = new BrowserID();