code highiglight not working comment

SyntaxHighlighter Evolved plugin installed on my blog. Code highlight working on post,but no comments..

I am showing the comment form with the different codes :

    form  method="post" name="commentform" onsubmit="return false" id="commentform"
    textarea name="comment" id="commentr" cols="50" rows="10" tabindex="4"  /textarea
    input type="hidden" name="send" id="send" value="1" /
    span class="t"/span
    input type="submit" class="sendmain" name="sendmain"  onclick="_sendmain('?php echo $post-ID; ?');" value="Send" /
    /form

What do you think the problem? My English is bad, I'm sorry. Thanks..