var browser =""
	var agt=navigator.userAgent.toLowerCase();
	var is_vr = parseInt(navigator.appVersion);
	
	var is_nav  = (agt.indexOf('mozilla')!=-1);
	var is_nav4 = (is_nav && (is_vr == 4));
	var is_nav5up = (is_nav && (is_vr >= 5));

	var is_ie   = (agt.indexOf("msie") != -1);
	var is_ie4  = (is_ie && (is_vr == 4) && (agt.indexOf("msie 5.0")==-1) );
	var is_ie4up  = (is_ie  && (is_vr >= 4) && (is_vr < 5));
	var is_ie5up  = (is_ie  && (agt.indexOf("msie 5.0")!=-1));
	
	var is_mac=(agt.indexOf("mac")!= -1 || agt.indexOf("mac_powerpc")!= -1);

	if (is_mac) {
		if (is_ie5up)
		{document.write('<LINK REL="stylesheet" REV="stylesheet" TYPE="text/css" HREF="/site_pc.css">')
		browser = "ie5up"
		}
		else if (is_nav5up)
		{document.write('<LINK REL="stylesheet" REV="stylesheet" TYPE="text/css" HREF="/site_pc.css">')
		browser = "nav5up"
		}
		else
		{document.write('<LINK REL="stylesheet" REV="stylesheet" TYPE="text/css" HREF="/site_mac.css">')
		browser = "mac"
		}
	}
	else if (is_ie4up)
	{document.write('<LINK REL="stylesheet" REV="stylesheet" TYPE="text/css" HREF="/site_pc.css">')
	browser = "ie4up"
	}
	else if (is_nav4)
	{document.write('<LINK REL="stylesheet" REV="stylesheet" TYPE="text/css" HREF="/site_pc.css">')
	browser = "nav4"
	}
	else
	{document.write('<LINK REL="stylesheet" REV="stylesheet" TYPE="text/css" HREF="/site_pc.css">')
	browser = "ie4up"
	}