help with IF code

[emath]

hey there,

i wanna do some code in a mode which shows my user gourps at the end of the index page.

there is the rows :

PHP Code:


            <phpcode><![CDATA[if (THIS_SCRIPT == "index" and $vbulletin->options['ugl_onoff'])
{
$activeusers2 .= '<br />';
$userbuls = split(',', $vbulletin->options['sirala']);
foreach($userbuls AS $userbul) {

$activeusers2 .= $vbulletin->usergroupcache["$userbul"]['opentag'] . $vbulletin->usergroupcache["$userbul"]['title'] .  ' >> '  . $vbulletin->usergroupcache["$userbul"]['closetag'];
}
$activeusers = '<b>'.$activeusers2 .'</b><br /><br />'. $activeusers;
}]]></phpcode> 


now i want that it will do the characters ">>" to every user group but the last...

so it will have an "if" that will check like if(!$last){ '>>' } i just tried to do that alot with no succeed any help ?