$(function() {
  $('#help_widget img.tab').click(function() {
    var w = $('#help_widget');
    if(w.css('right')!='-1px') {
      w.not(':animated').animate({right:'-1px'}).children('img.tab').attr('src', '/images/help_widget_tab_hide.png');
    }
  });
  $('#help_widget').click(function() {
    $('#help_widget').not(':animated').animate({right:'-302px'}).children('img.tab').attr('src', '/images/help_widget_tab.png');
  });
  var resize_handler = function() {
    var w = $('#help_widget');
    var top = ($(window).height()-w.height())/2;
    if(top<0) top = 0;
    w.css('top', top+'px');
  };
  $(window).resize(resize_handler);
  resize_handler();
});