$(window).load(function() {
  //if the right is bigger than the left (most of the time)
  if (($('#main_content').height()) > ($('#left_nav_wrap').height() + $('#bottom_img').height()) ) {
    $('#left_nav_wrap').height($('#main_content').height() + $("#footer").height() + 60);
  } else {
    $("#left_nav_wrap").height($('#left_nav_wrap').height() + $('#bottom_img').height() + 60);
    $('#footer').css('marginTop', $('#left_nav_wrap').height() - ($('#main_content').height() - $('#footer').height()) + "px");
  }
  $('#left_nav_wrap .left_bar').height($('#left_nav_wrap').height());
  $('#bottom_img').css('display', 'block');
});

$(document).ready(function() {
  //fix for ie6/7 and z-indexes
  $('#main_nav .grid_4:nth-child(4), #main_nav .grid_4:nth-child(5), #main_nav .grid_4:nth-child(6)').css('z-index', 0);
});