tmt_css_Mac_ie = "tipos/hojaestilo_mac_ie.css";
tmt_css_Win_ie = "tipos/hojaestilo_win_ie.css";
tmt_css_Mac_ns = "tipos/hojaestilo_mac_ns.css";
tmt_css_Win_ns = "tipos/hojaestilo_win_ns.css";

isMac = (navigator.appVersion.indexOf("Mac") != -1);
isWin = (navigator.appVersion.indexOf("Win") != -1);

if ((document.layers)&& (isMac)) 
	document.write("<link rel='stylesheet' href='" + tmt_css_Mac_ns + "' type='text/css'>");
else if((document.layers)&& (isWin)) 
	document.write("<link rel='stylesheet' href='" + tmt_css_Win_ns + "' type='text/css'>");
else {
	if (isMac)document.write("<link rel='stylesheet' href='" + tmt_css_Mac_ie + "' type='text/css'>");
	else document.write("<link rel='stylesheet' href='" + tmt_css_Win_ie + "' type='text/css'>");
}