if (URL != "http://your-server.com") {
// Already installed???
$burl = URL;
-} elseif ($burl == "") {
+} elseif (empty($burl)) {
// Auto-detect URL
$burl = "http://".$SERVER_NAME.$_SERVER['PHP_SELF'];
$burl = substr($burl, 0, strpos($burl, "install.php"));