Gravatar API in PHP, simple echo.

gravatar.php

/*
*@email - Email address to show gravatar for
*@size - size of gravatar
*@default - URL of default gravatar to use
*@rating - rating of Gravatar(G, PG, R, X)
*/
function show_gravatar($email, $size, $default, $rating)
{
	echo '<img src="http://www.gravatar.com/avatar.php?gravatar_id='.md5($email).
		'&default='.$default.'&size='.$size.'&rating='.$rating.'" width="'.$size.'px" 
		height="'.$size.'px" />';
}