Check to see if GD Library installed?

[Scubanaked]

Besides Error messages, which I'm getting, is there some sure fire way to test wether gd library is installed?
Brian

[sid]

method a)

<?PHP print phpinfo(); ?>

modules are listed alphabetically

method b)

<?PHP
//check if gd library is installed - © 2003 by mario.rader @ stargraphX.com
function gdCheck() {
	if (function_exists('imagecreatetruecolor')) {
		print "GD v2 installed";
	}
	elseif (function_exists('imagecreate')) {
		print "GD v1 installed";
	}
	else {
		print "GD not installed";
	}
}

gdCheck();
?>