function HideRibbon() {
   $('#s4-ribbonrow').hide();
   var newHeight = $(document).height();
   if ($.browser.msie) { newHeight = newHeight – 3; }
   $('#s4-workspace').height(newHeight);
}


$(document).ready(function(){
   if (typeof _spUserId == “undefined”) {
      HideRibbon();
   }else {
      ShowRibbon();
   }
});


$(document).keydown(function (e) {
   if (e.keyCode == 17) { ks = “a”; return false; }
   if (e.keyCode == 16) { if (ks == “a”) { ks = ks + “b”; return false; } }
   if (e.keyCode == 82) {
      if (ks == “ab”) {
         ks = “”;
         if($("#s4-ribbonrow").css(‘display’)==”none”) {
            //show
            ShowRibbon();
         } else {
            //hide
            HideRibbon();
         }
         return false;
      }
   }
   return true;
});