Problem with options_for_select

Hi,
I have a problem with the form select. In the value field I have the
generated html...

<%= f.select :brand_id,
                  options_for_select([['Brands', 0]] +
@search_brands.map { |b| [b.name, b.id]}),
                  {:id => 'cbxBrand', :tabindex => (@tabindex += 1)} %>

This is the html:
<select name="search[brand_id]" id="search_brand_id">
<option value="&lt;option
value=&quot;0&quot;&gt;Marques&lt;/option&gt;">&lt;option
value="0"&gt;Marques&lt;/option&gt;
</option>
<option value="&lt;option value=&quot;276987689&quot;&gt;Activ
distribution&lt;/option&gt;">&lt;option value="276987689"&gt;Activ
distribution&lt;/option&gt;
</option>

Am i forgetting a parameter or something?

Greg

Ok, I find out, it works without the options_for_select