Username HTML Markup: CSS No Underline

[Freesteyelz]

I'm trying to get all "$activeusers" links to display with no underline. The problem I'm finding with the Username HTML Markup is that it's inside the <a> tags. So if I use a <span> style or class call it won't override the <a> underline even when "!important" is used.

I was wondering if I can set a global call via plugin to achieve no underline in $activeusers links? Something like:

$activeusers = '<span class="ausrlink">'.$activeusers .'</span>';

I'll add the text-decoration attribute in CSS. While that's not the entire code, for the reason that I'm stuck (), is that possible to do? If so can someone please help with the plugin?