function updateSize() {
    var body = document.body,
      html = document.documentElement;
    var height = Math.max(body.scrollHeight, body.offsetHeight,
      html.clientHeight, html.scrollHeight, html.offsetHeight);

    height = Math.max(body.scrollHeight, body.offsetHeight);
    height = jQuery('body').innerHeight();

    var obj = {eventType: 'updateContentSize', params: {height: height}};
    window.parent.postMessage(obj, '*')
  }
 /* Use for FAQ */
  function onElementHeightChange(elm, callback) {
    var lastHeight = elm.clientHeight, newHeight;
    (function run() {
      newHeight = elm.clientHeight;
      if (lastHeight != newHeight)
        callback();
      lastHeight = newHeight;

      if (elm.onElementHeightChangeTimer)
        clearTimeout(elm.onElementHeightChangeTimer);

      elm.onElementHeightChangeTimer = setTimeout(run, 20);
    })();
  }

  window.addEventListener('message', function(e) {
    var message = e.data;
    if (message) {
      if (message.eventType) {
        switch (message.eventType) {
          case 'getAnchorPosition' : {
            if (message.params && message.params.anchor) {
              var currentAnchor = jQuery(message.params.anchor);
              if (currentAnchor.length) {
                console.log(currentAnchor.position().top);
                var obj = {
                  eventType: 'responseAnchorPosition',
                  params: {top: currentAnchor.position().top}
                };
                window.parent.postMessage(obj, '*')
              }
            }
            break;
          }
          default: {
            break;
          }
        }

      }
    }
  });

  jQuery(window).load(function() {    
    jQuery('a:not([target]), a[target="_self"]').attr('target', '_parent');
    updateSize();
    /* Use for FAQ */
    onElementHeightChange(document.body, function() {
      updateSize();
    });
  });

  jQuery(window).resize(function() {
    updateSize();
  });