what does QBbusyHide() does?

in the technique "Scooby do and save"


(function(){
  var querystring=document.location.search;

  if (/nwr/i.test(querystring)) {

    $("<iframe>", {id: "QBU_editform", name: "QBU_editform"})
      .css({display: "none"})
      .appendTo("body")
      .on("load", function() {
        QBbusyHide();
        var rid = this.contentWindow.kRid;

        var markup = "";
        markup += "<h2>You just created a new record with [Record ID#] = " + rid + " !<h2>";
        markup += "<center><img src=&#039;http://vignette3.wikia.nocookie.net/hanna-barbera/images/2/24/Scoobydoo.jpg' height='200'></center>";
        $("<div>").html(markup).dialog({
          title: "Save and Scooby Doo!",
          modal: true,
          close: function(event, ui) {
            document.location.href = gReqDBID + "?a=er&rid=" + rid;
          }
        });
      });
    $("form[name=editform]").prop({target: "QBU_editform"});
  }

})();