FCKeditor_OnComplete problem with firefox

function FCKeditor_OnComplete( editorInstance )   {
   
       var oEditor = FCKeditorAPI.GetInstance(editorInstance.Name) ;
      
     // oEditor.Commands.GetCommand('NewPage').Execute();// <- delete this to resolve the problem .. :\
      
      var content=parent.document.getElementById(editorInstance.Name).value;
      oEditor.InsertHtml(content);
      content=null;
}