[Digitalus]

You can do that with css,

Put this in your css template in each style

.staffcolor_admin{background:transparent;color:#666666}

and this in your usergroup Username HTML Markup

<font class="staffcolor_admin">

or 

<strong class="staffcolor_admin" style="font-style:italic">

and in de second field you do

</font>

or 

</strong>

Goodluck..