little problem with Anti-Splog Move wp-signup.php

Hi, we have a little problem with AntiSplog move wp-singup.php.
i´m trying to put the new funtion <?php ust_wpsignup_url(); ?> in my theme.

if a put this in a image:
"><img src="wp-content/themes/mytheme/images/alta.png" />

I can not see the image. sure it is something easy, but I don´t see

sorry for my English, i´m spanish.
thanks...