function AttachEvent(elementObj, eventName, eventHandlerFunctionName)
{
  if (elementObj.addEventListener) 
  { // Non-IE browsers
    elementObj.addEventListener(eventName, eventHandlerFunctionName, false);		
  } 
  else if (elementObj.attachEvent) 
  { // IE 6+
    elementObj.attachEvent('on' + eventName, eventHandlerFunctionName);
  } 
  else 
  { // Older browsers 
    var currentEventHandler = elementObj['on' + eventName];
    if (currentEventHandler == null) 
    {
      elementObj['on' + eventName] = eventHandlerFunctionName;
    } 
    else 
    {
      elementObj['on' + eventName] = function(e) { currentEventHandler(e); eventHandlerFunctionName(e); }
    }
  }
}