function mm_on(oThis, sImgName)
  {
    oThis.src = 'gfx/'+sImgName+"_on.gif";
  }
  function mm_off(oThis, sImgName, sMenuON)
  {
    if ( sImgName!=sMenuON )
      oThis.src = 'gfx/'+sImgName+"_off.gif";
  }

  function subm_on(sObjID)
  {
    document.getElementById(sObjID).className='left_on';
  }
  function subm_off(sObjID)
  {
    document.getElementById(sObjID).className='left_off';
  }
  
  function subm2_on(sObjID)
  {
    document.getElementById(sObjID).className='left2_on';
  }
  function subm2_off(sObjID)
  {
    document.getElementById(sObjID).className='left2_off';
  }