Allowing images in sigs for certain usergroups? (detailed question about my code)

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This is how I'm trying to do it... in includes/functions_bbcodeparse.php

replacing this:

PHP Code:

        // parse non-forum item
        case 'nonforum':
            $dohtml = $vboptions['allowhtml'];
            $dobbcode = $vboptions['allowbbcode'];
            $dobbimagecode = $vboptions['allowbbimagecode'];
            $dosmilies = $vboptions['allowsmilies'];
            if ($allowsmilie != 1)
            {
                $dosmilies = $allowsmilie;
            }
            break; 


with this:

PHP Code:

        // parse non-forum item
        case 'nonforum':
            $dohtml = $vboptions['allowhtml'];
            $dobbcode = $vboptions['allowbbcode'];
            if($post['usergroupid'] == 6)
            {
            $dobbimagecode = 1;
            }
            else {
            $dobbimagecode = $vboptions['allowbbimagecode'];
            }
            $dosmilies = $vboptions['allowsmilies'];
            if ($allowsmilie != 1)
            {
                $dosmilies = $allowsmilie;
            }
            break; 


Now, I've isolated the problem being in that it doesn't know what "$post['usergroupid']" is, as it's not recalling the variable whatsoever. Is there a way to get around this or a different way to go about doing this as opposed to just having it apply universally?