Parse error: syntax error, unexpected T_ELSE

Bonjour,

Je ne trouve pas l'erreur qui doit être dans le if else en bas. merci.

$nb_bids = $this->num_rows($sql_select_bids);

$counter = 0;
while($media_details = $this->fetch_array($sql_select_media))
{
$counter++; // start at 1

if ($counter != 1) { $display_output .= '
<li>'; }
else { $display_output .= '<li class="active">'; }

$display_output .= MSG_IMG_ADD .'<br>';
$display_output .= show_date($media_details["date"]);
$display_output .= '<img src="thumbnail.php?pic=' . $media_details["media_url"] . '&w=500&sq=Y&b=Y" alt="image">';
$display_output .= '</li>';

}

if ($nb_bids = 1)
{

$display_output = '<ul class="slider">'.$display_output.'</ul>';
return $display_output;

else { $display_output .= '<li class="active">'; }
}