var menuList = [
  ["技术研究","index_tech.html"],
  ["读书心得","index_read.html"],
  ["作品", "index_work.html"],
  ["思考", "index_thought.html"],
  ["Tech", "index_tech_e.html"],
  ["Reading", "index_read_e.html"],
  ["Works", "index_work_e.html"],
  ["Thoughts", "index_thought_e.html"]
];

function selectMenuItem(event)
{
  getEventSource(event).className = "menuItemActive";
}

function unselectMenuItem(event)
{
  getEventSource(event).className = "menuItem";
}

function fireMenuItem(event)
{
  // find url for menu item
  select = getEventSource(event).innerHTML;

  for ( i = 0; i < menuList.length; ++i )
  {
    if ( menuList[i][0] == select )
    {
        window.location.href = menuList[i][1];
    }
  }
}

function getEventSource(event)
{
  var src;

  if ( event == null ) // IE fix
     event = window.event;
  if ( event.srcElement ) // IE fix
     src = event.srcElement;
  else
     src = event.target; // Mozilla or others

  if ( src.nodeType == 3 )
     src = src.parentNode; // Safari

  return src;
}