<?php
$email = "your_users_email@site.com";
$size = 64; // Size, in pixels
$gravatar_link = 'http://www.gravatar.com/avatar/' . md5($email) . '?s='.$size;
echo '<img src="' . $gravatar_link . '" />';
?>
<?php
$email = "your_users_email@site.com";
$size = 64; // Size, in pixels
$gravatar_link = 'http://www.gravatar.com/avatar/' . md5($email) . '?s='.$size;
echo '<img src="' . $gravatar_link . '" />';
?>