[Logikos]

Cheap way to do it:

PHP CODE
Using this will add a value to $random. That value can be anywhere between the #1 threw the #5.

PHP Code:

$random = rand(1, 5); 


Template Condition can be...

<if condition="$random == '3'">
        <if condition="$show['gotonewpost']">
                <strong><a href="SPONSOR URL" id="thread_title_$thread[realthreadid]">$thread[threadtitle]</a></strong>
        <else />
                <a href="SPONSOR URL" id="thread_title_$thread[realthreadid]">$thread[threadtitle]</a>
        </if>
<else />
        <if condition="$show['gotonewpost']">
                <strong><a href="showthread.php?$session[sessionurl]t=$thread[threadid]$thread[highlight]" id="thread_title_$thread[realthreadid]">$thread[threadtitle]</a></strong>
        <else />
                <a href="showthread.php?$session[sessionurl]t=$thread[threadid]$thread[highlight]" id="thread_title_$thread[realthreadid]">$thread[threadtitle]</a>
        </if>
</if>

That will make it a 1 & 5 chance that the value of $random will be equaled to 3. Maybe this can give you a tip in the right direction :ermm: