What version are you running Sebastian? What you're asking for is native to vb3. If you've modified the reply button out of your showthread template, replace
<img src="$stylevar[imgdir_button]/reply.gif" alt="$vbphrase[reply]" border="0" />
with
<if condition="$show['closethread']"><img src="$stylevar[imgdir_button]/reply.gif" alt="$vbphrase[reply]" border="0" /><else /><img src="$stylevar[imgdir_button]/threadclosed.gif" alt="$vbphrase[closed_thread]" border="0" ></if>
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