How to IF Statement

[bada_bing]

I am trying to combine an "IF condition but having some issues doing so.

I want to a combine if conditions.. if condition= specific filedxxx and if condition= specific usergroup

Below is what im trying to use.

<if condition="is_member_of($vbulletin->userinfo, 2,5,6,7,11,12,13,16,17)">
<if condition="$bbuserinfo['field4647']=='No'">
<else />
       <!-- Footer Code Start -->
       <link type="text/css" rel="stylesheet" media="all" href="/forums/mrchat/chatcss.php" charset="utf-8" />
       <script type="text/javascript" src="/forums/mrchat/chatjs.php" charset="utf-8"></script>
       <!-- Footer Code End -->
</if>