Conditional code - how to?

[hem]

Okay, new code block:

</ul>
<center>
<br />
<span id="productQuestions" class="biggerText">
<br />
<b>
<?php
if($_GET['product_is_call'])
 echo '<a href="'. zen_href_link(FILENAME_ASK_A_QUESTION_SAMPLE, 'products_id=' . $_GET['products_id']) . '">' . ASK_A_QUESTION_SAMPLE . '</a>'; 
else
 echo '<a href="' . zen_href_link(FILENAME_ASK_A_QUESTION, 'products_id=' . $_GET['products_id']) . '">' . ASK_A_QUESTION . '</a>';
?></b>
</span>
</center>
<br class="clearBoth" />

I'm guessing that $_GET['product_is_call'] is accessible- sorry don't have the mod you do but do a copy and paste and see if it works. If it doesn't I'll look at the code required to access the 'product_is_call' field.