Help! Users cant register

[razorownz]

Error:
Parse error: parse error in /home/w/worldofc/www/forum/register.php on line 504

Code:
$homepage = trim($homepage);
if ($homepage) {
if (preg_match('#^www\.#si', $homepage)) {
$homepage = "http://$homepage";
} else if (!preg_match('#^[a-z0-9]+://#si', $homepage)) {
// homepage doesn't match the http://-style format in the beginning -- possible attempted exploit
$homepage = '';

Line 504:
if (preg_match('#^www\.#si', $homepage)) {