adding if statment kills\ignores the html

I tried consulting in other forums and in this one but no one knows how to resolve this:

when adding an “if(!empty($data))” php statement the html is ignored. for example:

<a href="http://<?php bp_member_profile_data('field=facebook'); ?>" title="My facebook">
  <img src="images/facebook.png" alt="facebook" />
 </a>

in any form of syntax I used when adding if before it the outcome is only the field data without all the html.

for example: adding if like that:

<?php
 $Usr_Url = bp_member_profile_data('field=facebook');
if ( $Usr_Url != "" ) { ?>

  <a href="http://<?php bp_member_profile_data('field=facebook'); ?>" title="My facebook">
 <img src="images/facebook.png" alt="facebook" />
</a>

 <?php } ?>

Displayed only the fields data and ignore all html but if like on first case liek I wrote the all html is displayed.