How to use is_member_of in template postbit

[achoo254]

I tried but dont work, this is my plugin:

	<plugin active="1" executionorder="5">
			<title>Demo</title> 
			<hookname>postbit_display_complete</hookname>
			<phpcode><![CDATA[global $vbulletin;
					$show['hidehack'] = is_member_of($post, explode(',', $vbulletin->options['select_groupid']));
		]]></phpcode>
		</plugin>

and my template postbit_legacy:

<vb:if condition="$show['hidehack']">code here</vb:if>