$(function init($) 
{
    // copyright Drupal, GNU General Public License
    $('textarea.resizable:not(.textarea-processed)').each(function() {
        var textarea = $(this).addClass('textarea-processed'), staticOffset = null;

        // When wrapping the text area, work around an IE margin bug.  See:
        // http://jaspan.com/ie-inherited-margin-bug-form-elements-and-haslayout
        $(this).wrap('<div class="resizable-textarea"><span></span></div>')
          .parent().append($('<div class="grippie"></div>').mousedown(startDrag));

        var grippie = $('div.grippie', $(this).parent())[0];
        grippie.style.marginRight = (grippie.offsetWidth - $(this)[0].offsetWidth) +'px';

        function startDrag(e) {
          staticOffset = textarea.height() - e.pageY;
          textarea.css('opacity', 0.25);
          $(document).mousemove(performDrag).mouseup(endDrag);
          return false;
        }

        function performDrag(e) {
          textarea.height(Math.max(32, staticOffset + e.pageY) + 'px');
          return false;
        }

        function endDrag(e) {
          $(document).unbind("mousemove", performDrag).unbind("mouseup", endDrag);
          textarea.css('opacity', 1);
        }
    });
});