if(navigator.appName == "Microsoft Internet Explorer"){
   var versionStr = (navigator.userAgent).split(";")[1].split(" ")[2];
   var version = parseFloat(versionStr);

   if(version < 7){
      document.write('' +
      '<link href="' + css_ext_path + 'css/MenuMatic-ie6.css" rel="stylesheet" type="text/css" />' +
      '');
   }

   if(version < 7){
      document.write('' +
      '<link href="' + css_ext_path + 'css/select_fix.css" rel="stylesheet" type="text/css" />' +
      '');
   }
}