function showhide_cmb(st) {

    var isGecko = navigator.userAgent.indexOf('Gecko') != -1;
    if (! isGecko) {
      if (document.frames['ieframef']) {
        if (document.frames['ieframef'].document.forms[0].Cmb_ART != 'undefined') {
          var elem = document.frames['ieframef'].document.forms[0].Cmb_ART;
          if (st) {
            elem.style.display = "inline";
          }
          else {
            elem.style.display = "none";
          };
        };
      };
    };
};