vBulletin sig text decoration

Okay, with vBulletin I want to change a few things. And you have to edit then in the Style manager (edit templates).

Currently when a link is posted in a topic, it's Underlined (which is fine). But in a person's signature, a link is also underlined. This I don't want. I want the Sig only to not be underlined. Which I have the code for:

Code:

---

<STYLE type="text/css">
<!--
A {  text-decoration:none }
 a:hover { text-decoration: underline }
-->
</STYLE>

---

So the right template under "Postbit Templates>postbit_wrapper". So if you put the code (above) in there, it changes the Posts AND the sigs.

So does anyone know a way to just change it for signatures? Hope that wasn't to hard to understand..