if (navigator.userAgent.indexOf("Win")>=0){
		document.write("<link rel=\"stylesheet\" type=\"text/css\" href=\"css/style_win.css\">");
	} else if (navigator.userAgent.indexOf("Mac")>=0) {
		if (navigator.userAgent.indexOf("mozilla")>=0){
			document.write("<link rel=\"stylesheet\" type=\"text/css\" href=\"css/style_mozilla.css\">");
		} else {
			document.write("<link rel=\"stylesheet\" type=\"text/css\" href=\"css/style_mac.css\">");
		}
	} else {
		document.write("<link rel=\"stylesheet\" type=\"text/css\" href=\"css/style_win.css\">");
	}