if ((navigator.userAgent.indexOf("Win") != -1)) {
	document.write("<link rel=\"stylesheet\" href=\"../css_os/win.css\" type=\"text/css\">");
}
else if ((navigator.userAgent.indexOf("Mac") != -1)) {
	document.write("<link rel=\"stylesheet\" href=\"../css_os/mac.css\" type=\"text/css\">");
}
else {
	document.write("<link rel=\"stylesheet\" href=\"../css_os/other.css\" type=\"text/css\">");
}