function addEventListener(o,sType,sFunction,bCapture){
    if(o.addEventListener)o.addEventListener(sType,sFunction,bCapture);
    else if(o.attachEvent)o.attachEvent('on'+sType,sFunction);
  }

  function removeEventListener(o,sType,sFunction,bCapture){
    if(o.removeEventListener)o.removeEventListener(sType,sFunction,bCapture);
    else if(o.detachEvent)o.detachEvent('on'+sType,sFunction);
  }