Avatars dnt show on ejay29 script

[riderz]

Hey guys im strugling to get my avatars show on my site i think this part might be the error

function idle($uid, $w, $h){

if(isonline($uid)==1){
$class = "online";
}else if(isonline($uid)==2){
$class = "idle";
}else{
$class = "offline"; 
}

$ava = mysql_fetch_array(mysql_query("SELECT * FROM mx_users WHERE id='".$uid."'"));

if($ava[avatar]==""){
$avatar = "<img src=\"../thumb.php?image=images/noavatar.gif&amp;w=$w&amp;h=$h\" alt=\"noavatar\" class=\"$class\"/>";
}else if(!file_exists($ava[avatar])){
$avatar = "<img src=\"../thumb.php?image=images/noavatar.gif&amp;w=$w&amp;h=$h\" alt=\"noavatar\" class=\"$class\"/>";
}else{
$avatar = "<img src=\"../thumb.php?image=".htmlspecialchars($ava[avatar])."&amp;w=$w&amp;h=$h\" alt=\"avatar\" class=\"$class\"/>";
}
return $avatar;
}

[something else]

$ava["avatar"]