if (window.rcmail)
  rcmail.addEventListener('init', function() { hide_blockquote(); });

function hide_blockquote()
{
  var limit = rcmail.env.blockquote_limit;

  if (limit <= 0)
    return;

  $('pre > blockquote', $('#messagebody')).each(function() {
    var div, link, q = $(this),
      text = $.trim(q.text()),
      res = text.split(/\n/);

    if (res.length <= limit) {
      // there can be also a block with very long wrapped line
      // assume line height = 15px
      if (q.height() <= limit * 15)
        return;
    }

    div = $('<blockquote class="blockquote-header">')
      .css({'white-space': 'nowrap', overflow: 'hidden', position: 'relative'})
      .text(res[0]);

    link = $('<span class="blockquote-link"></span>')
      .css({position: 'absolute', 'z-Index': 2})
      .text(rcmail.gettext('hide_blockquote.show'))
      .data('parent', div)
      .click(function() {
        var t = $(this), parent = t.data('parent'), visible = parent.is(':visible');

        t.text(rcmail.gettext(visible ? 'hide' : 'show', 'hide_blockquote'))
          .detach().appendTo(visible ? q : parent);

        parent[visible ? 'hide' : 'show']();
        q[visible ? 'show' : 'hide']();
      });

    link.appendTo(div);

    // Modify blockquote
    q.hide().css({position: 'relative'}).before(div);
  });
}