[Renmiri]

Sounds to me you need to
FIND

			<if condition="$show['ajax_resolve']">
				<a href="online.php?$session[sessionurl]do=resolveip&amp;ipaddress=$userinfo[host_encoded]" id="resolveip_$count" title="$vbphrase[resolve_ip_address]">$userinfo[host]</a>
			<else />
				$userinfo[host]
			</if>

To make it easier for you, just replace the entire thing you found above with this

			<if condition="$show['ajax_resolve']">
				<a href="online.php?$session[sessionurl]do=resolveip&amp;ipaddress=$userinfo[host_encoded]" id="resolveip_$count" title="$vbphrase[resolve_ip_address]">$userinfo[host]</a>
			<else />
				<a href="http://www.dnsstuff.com/tools/whois.ch?ip=$userinfo[host]">$userinfo[host]</a>
			</if>

The only change is the the $userinfo[host] after the <else /> is now a link. Want to give it a try ? I don't have 3.6 yet so I can't test it but I don't foresee any troubles.

PS: Set ajax_resolve vb option to NO or FALSE if you haven't already