<?php if (!S2MEMBER_CURRENT_USER_IS_LOGGED_IN){ ?>
  <a href="<?php echo S2MEMBER_MEMBERSHIP_OPTIONS_PAGE_URL; ?>">Please Signup</a>
  | <a href="<?php echo S2MEMBER_LOGIN_PAGE_URL; ?>">Or Login</a>
<?php } ?>

---- s2member Shortcode Equivalent ----

[s2Get constant="S2MEMBER_LOGIN_PAGE_URL" /]