if(navigator.userAgent.indexOf('IRIX') != -1) { var OpSys = "Irix"; }
	else if((navigator.userAgent.indexOf('Win') != -1) && (navigator.userAgent.indexOf('95') != -1))
		{ var OpSys = "Windows95"; }
	else if(navigator.userAgent.indexOf('Win') != -1) { var OpSys = "Windows3.1 or NT"; }
	else if(navigator.userAgent.indexOf('Mac') != -1) { var OpSys = "Macintosh"; }
	else { var OpSys = "other"; }

	//return OpSys;
	
	if (OpSys == "Macintosh") { document.write("<link rel=stylesheet href=css/style.css>"); }
	else { document.write("<link rel=stylesheet href=css/win-style.css>"); }