var nome=navigator.userAgent;
var ondesign=0;
var contact = "E-Mail senden";
var contact_f = "E-Mail";
var emailHost = "syngenta.com";
var legal=navigator.appVersion.substr(0,4);

brow=nome.search("Mac");

if (brow != -1)  {
   document.write("<LINK REL='stylesheet' HREF='muerren_mac.css' TYPE='text/css'>");
 }
else {
   document.write("<LINK REL='stylesheet' HREF='muerren_windows.css' TYPE='text/css'>");
   }