AllVideo Reloaded in short description problem

Hey, I have been looking around everywhere for a fix to this small problem im having. I have used a hack from the forum to be able to add a AllVideo Plugin to the short description on the category browse page, so the user can click a play button on the browse page rather than going into the fly page.
The hack worked in the fact that it allowed me to add a play feature which worked, but when you now click onto the 'product details' page, I get part of the code displayed in the top left corner of the page. Here is a link so you can see what I mean:
http://dhwebsitedesigns.co.uk/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=6&category_id=1&option=com_virtuemart&Itemid=17

If anyone has any ideas why this isn't working please let me know asap!

Many Thanks