[jQuery] attribute is null

[robing]

i am wanting to grab the next href attribute from a clicked anchor,
when i use the code below i get everything in between the div next to
the selected one;
          var nextHref = $(this).parent("div").next("div").html();

but when i try to get the href i get null.
         var nextHref = $(this).parent("div").next("div
a").attr("href");

can anyone tell me what i am doing wrong?

  <div style='width: 496px; text-align:left;'><div
style='display:inline;'>
        <a class='thickbox' rel='facebox' href='http://robing.co.nz/
jquery/xhibit/display_page.htm' target='_blank' >
        <img class='tbImg'   src='http://robing.co.nz/snippets/xhibit/
generate_thumbnail.php' alt='' /></a>
    </div><div style='display:inline;'>
        <a class='thickbox' rel='facebox' href='http://robing.co.nz/
jquery/xhibit/display_page.htm' target='_blank' >
        <img class='tbImg' src='http://robing.co.nz/snippets/xhibit/
generate_thumbnail.php' alt='' /></a>
    </div>
  </div>