I'm assuming you're trying to change the [previous] and [next] links when you're viewing a message (ie. in msgs_body.htm). You'd change it from:
<%if msgs_prev%><a href="<%msgs_prev%>">[previous]</a><%else%> <%endif%>
to:
<%if msgs_prev%><a href="<%msgs_prev%>"><img src="<%url_images%>/templates/<%t%>/Prev.gif" alt="Previous Message"></a><%else%> <%endif%>
and the similar for next...
Adrian
<%if msgs_prev%><a href="<%msgs_prev%>">[previous]</a><%else%> <%endif%>
to:
<%if msgs_prev%><a href="<%msgs_prev%>"><img src="<%url_images%>/templates/<%t%>/Prev.gif" alt="Previous Message"></a><%else%> <%endif%>
and the similar for next...
Adrian