Some of the popups need a slightly different design but I found out that I cannot differentiate between the different popups with css.

I changed popups.js a bit so that it now can take an extra popup option: extraclass.
This will then turn up as an class in the main popup div.

for example

    '#popupitem'=> array( 

        'width' => '550px',
        'extraclass' => 'redtitle',

     ),

gives

  <div id="popups" class="redtitle" style="left: 353px; width: 550px; top: 161px;">