//第六步，修改版主
function On_ChangeMaster()
    {
      //如果没有论坛被选中，则退出
      if (frmManager.selForumName .selectedIndex == -1)
        {
          return 0 ;
        }
          
      if (frmManager.btnChangeMaster .value == "修改")
        {
          frmManager.btnChangeName  .disabled       = true ;
          frmManager.btnDown .disabled              = true ;
          frmManager.btnUp .disabled                = true ;
          frmManager.btnModifyDescription .disabled = true ;
          frmManager.btnAddForum .disabled          = true ;
          frmManager.btnDeleteForum .disabled       = true ;
          frmManager.btnSubmit .disabled            =true ;
          frmManager.selCategoryName .disabled      = true ;
          frmManager.selForumName .disabled         = true ;
          frmManager.selMaster .disabled            = false ;
          frmManager.btnChangeMaster.value          = "确定" ;
          return 0 ;
        }
      else
        {
          frmManager.btnChangeMaster.value          = "修改" ;
          frmManager.selCategoryName .disabled      = false ;
          frmManager.selForumName .disabled         = false ;
          frmManager.selMaster .disabled            = true ;
          frmManager.btnSubmit .disabled            = false ;
          var intForumIndex ;
          for (var i = 0 ; i < aForum.length ; i ++)
             {
              if (frmManager.selForumName[frmManager.selForumName.selectedIndex].value == aForum[i].CategoryID )