Blinking/Flashing on .mouseenter

Blinking/Flashing on .mouseenter

Hi I'm using the following jQuery to hide and reveal a text div on this portfolio site

<script type="text/javascript">
jQuery(function($) {
      $('div.photo').mouseenter(function() {
            $(this).siblings('.rollover').show();
      }).mouseleave(function() {
            $(this).siblings('.rollover').hide();
      });
});
</script>

One of the contributors on here helped me tidy up the code. My problem now is I get a flashing blinking effect when the cursor is over the .photo div. You can see the problem by clicking the link above.

Any advice would be appreciated 

Thanks
Tom