Adding style to css file with plugin code

[Christos Teriakis]

Hello,

Is there any way to add an extra style to a css file (eg vbulletin.css) using plugin code (inside a product xml file)?

For example I want to add the follow style to popupmenu.css

.memberaction_body.popupbody li .siteicon_dating
{
background:url({vb:stylevar imgdir_siteicons}/dating.png) {vb:stylevar left} 2px no-repeat;
}


Thank you
Christos