an example of how to build a js array from a php array:
<script language="JavaScript1.2">
var userNames = new Array();
<?
$usernames = array("name1","name2","name3","name4");
for ($i=0;$i<count($usernames);$i++){
?>
userNames[<?=$i?>] = "<?=$usernames[$i]?>";
<?
}
?>
for (z=0;z<userNames.length;z++){
alert(userNames[z]);
}
</script>