if (navigator.appVersion.indexOf("Win") == -1 && parseInt(navigator.appVersion) < 5 && navigator.appName.indexOf("MSIE 5") == -1) {
   document.write('<style type="text/css"> <!-- ');
   document.write('@import url(stylesheets/explorer_mac.css);');
   document.write('--> </style>');
} else {
   document.write('<style type="text/css"> <!-- ');
   document.write('@import url(stylesheets/explorer_win.css);');
   document.write('--> </style>');
}