Mine

function g2_imageblock( $g2itemid ) {
	global $g2_option;

// Initialize Gallery
	if (!defined('G2INIT')) {
		$ret = g2_login();
		if ($ret->isError()) {
			echo "<h2>Fatal G2 error</h2> Here's the error from G2: " .$ret->getAsHtml(); 
			exit;
		}
	}