Free gift

Hi, I went searching on how to add a free gift and I can do it using classes but that doesn't take into consideration any of my attributes. So I thought that this code could work:

<?php if ($cart->show_total()>=35) { ?>
 
<font face="Verdana, Arial, Helvetica, sans-serif" size="2" color=red> <a href="<A href="http://www.your_site.co.uk/catalog/default.php?cPath=169">You">http://www.your_site.co.uk/catalog/default.php?cPath=169">You have spent enough for a free gift.<b> Click here </B>to choose one if you haven't already </a></font>
 
<?php
} else { 
 
         echo "<font face=Verdana size=2 color=red><b>";
echo "You only have to spend ";
echo $currencies->format(-$cart->show_total()+35);
echo " more to receive your free gift.</b>";
echo "</font>";
 } ?>

But I have tried putting it into a few files and can't get it to work (or some permutation of it). Can someone point me in the right direction? I also know that the link has to be changed so as not to point to a cPath... Which I do know how to do, but even if I add it to shopping_cart.php, it doen't want to work. I appreciate any help that can be thrown my way.

Thank you!