[jQuery] Fancybox from alt text

[casperMC]

hi,

im trying to wrap a fancybox link around each image on a site, which
has an alt tag specified.

Right now i have this html markup:

<p>
   <img src="1_s.jpg" alt="1_b.jpg" title="asdasd" />
</p>

And this javascript-code:

$(document).ready(function() {
    $("img[alt]").each(function(){
        $(this).wrap($('<a href="'+$(this).attr('alt')+'"
class="fancyBoxImage">'));
    });
    $(".fancyBoxImage").fancybox();
});

And it's working perfect in every browser, except IE7 and 8 (haven't
tested it in IE6 yet).

Does anybody has a explanation for it?