Conflict with Add to cart Button action="" and Template page

Hi, my product_detail page works fine until I add the Add to Cart Button and all the design stops working. If I erase the action from the form the page I can see the page design again. The form is added by the Add to Cart behavior:

<form name="eCart2_1_ATC_<?php echo $row_productos["ProductID"]; ?>" method="POST" action="<?php echo $_SERVER["PHP_SELF"]; ?><?php echo (isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"] != "")?"?".htmlentites($_SERVER["QUERY_STRING"]):""; ?>">
<input type="hidden" name="eCart2_1_ID_Add" value="<?php echo $row_productos["ProductID"]; ?>" >
<input type="hidden" name="eCart2_1_Quantity_Add" value="1" >
<input type="submit" class="button" value="Add to Cart" name="eCart2_1_ATC">
</form>

My recordset is like has this: WHERE ProductID = colname and colname is equal to $_GET['ProductID'] if I change my recordset like this WHERE ProductID = 1 or any other number, the Cart button works fine but my page is dynamic and I sell several products so I cannot put a single number in the recordset. I need to get the product ID from somewhere.

Thank you in advance for your help.

I'll need to troubleshoot directly, see the private message section.

Hi Jason, My site is not online yet. may I send you the files as attachments?

looking at the code does not explain why it is causing problems, i will need you to upload the pages to the server so I can see the problem to troubleshoot the cause.

I solved the problem, I manually add a button and then I used the Add to Cart from the server behaviors panel and it worked. Before I was using the Add to Cart button from the webassist menu at the menu bar.