jQuery(function($) {
  var slide = false;
  var height = $('#mess').height();
  $('#footer_button').click(function() {
    var docHeight = $(document).height();
    var windowHeight = $(window).height();
    var scrollPos = docHeight - windowHeight + height;
    $('#mess').animate({ height: "toggle"}, 1000);
    if(slide == false) {
      if($.browser.opera) { //Fix opera double scroll bug by targeting only HTML.
        $('html').animate({scrollTop: scrollPos+'px'}, 1000);
      } else {
        $('html, body').animate({scrollTop: scrollPos+'px'}, 1000);
      }
                               slide = true;
    } else {
                               slide = false;
                       }
  });
});