Conditional Statement Help

[Opserty]

<if condition="((THIS_SCRIPT == 'showthread') AND ($show['member']) AND ($threadinfo['dateline'] < (TIMENOW - 2419200))) OR $forumid == 33">
    output something
<else />
    <if condition="$show['member']">
        output something
    </if>
</if>

If it doesn't work, take out the different conditions bit by bit and find which is causing the problem.