[Simon Lloyd]

Your first will be done in your Main Css (look for the <a> tags and see if underline has been set there, as for your second it's already centered, if thats someone elses then in your postbit_legacy template look for this

<tr valign="top">
	<td class="alt2" width="175" style="border: $stylevar[cellspacing]px solid $stylevar[tborder_bgcolor]; border-top: 0px; border-bottom: 0px">

			<div id="postmenu_$post[postid]">

and replace it for this

<tr valign="top" align="center">
	<td class="alt2" width="175" style="border: $stylevar[cellspacing]px solid $stylevar[tborder_bgcolor]; border-top: 0px; border-bottom: 0px" align="center">

			<div id="postmenu_$post[postid]">

Hope that helps!