Thanks,
if the user has JavaScript disabled, we can add :
HTML Code:
<a class="collapse" id="collapse_cel_dummy" href="{vb:raw relpath}#top"><img src="{vb:stylevar imgdir_button}/collapse{vb:raw vbcollapse.collapseimg_cel_dummy_img}_40b.png" alt="{vb:rawphrase collapse_this_category}" /></a>
<noscript>You need to have JavaScript enabled so that you can use this ...</noscript>