If/Else display Anchor Button

Some of my products include a video clip at the bottom of the product description page. I'd like to add a button, 'See Video' that will anchor tag to the video at the bottom of the page. I would like the button to display near the top of the tpl_product_info_display . But ONLY be visible if a video exist on the page. The videos are embedded HTML Youtube videos. So maybe if($exists('embedded')) {
then {

Any ideas on the code needed to for this?

You could try the "Product Extra Files" plugin.

From the description for Product Extra Fields, it might be possible to use it, but sounds like overkill as you are not asking for downloadable files but embedded (Youtube?) videos. It still wouldn't give the conditional link without extra coding.
Product Articles has optional handling features that could be used for this, but it would really work as well as anything to make a conditional that looks for the existence of a diagnostic string in the description in order to toggle the link. Something like```php
if (strpos($products_description,'embed')) { //if the text embed does not appear in any descriptions but does appear in the embedding code
echo '<a href="' . zen_href_link(zen_get_info_page($_GET['products_id']), zen_get_all_get_params(array('number_of_uploads')) ) . '#video' . '"><img src="INSERT BUTTON IMAGE PATH HERE" />See video</a>';
}

<http://www.zen-cart.com/showthread.php?149636-Named-Anchors-Not-Working>

PERFECT
Thank you!

Added the code above from gjh to includes/templates/My_TEMPLATE/templates/tpl_product_info_display.php where I wanted the button to show and added an id for styling:

<!--bof product video -->
<?php if (strpos($products_description,'embed')) { //if the text embed does not appear in any descriptions but does appear in the embedding code
 echo '<a href="' . zen_href_link(zen_get_info_page($_GET['products_id']), zen_get_all_get_params(array('number_of_uploads')) ) . '#video' . '"><img id="video_button" src="http://keepsafeco.com/includes/templates/12497/buttons/english/watch-the-video-button.gif"></a>';
}  
?>
<!--eof product video -->

Then, as gjh pointed out from DrBytes linked post, I just added ```
<a name="video">

Here's how it looks:
[Baby Gate](http://keepsafeco.com/baby-safety-gates/playpens/indoor-and-outdoor-playpen---colorplay-superyard?cPath=29_37)