Hey guys -
I am totally stumped on how to get a bit of javascript attached to the update quantity field in the shopping cart page.

What I want to do is hide the "Update Cart" button next to the quantity update field unless they change the quantity. I have done this on another shopping cart using the following code:

Code:
 <input name="cart_quantity[]" value="1" size="4" type="text" onKeyDown="visOn('cu');visOff('co');">
The problem I am having is that updating the quantity field in /modules/pages/shopping_cart/header_php.php does not change anything. Even if I just change the size of the input field. here is the line I am trying to change it to:

Code:
 $quantityField = zen_draw_input_field('cart_quantity[]', $products[$i]['quantity'], 'size="5" onKeyDown="visOn(\'cu\');visOff(\'co\');"');
Even changing the size to '5' does not change it. So I am trying to figure out if there is somewhere else that could be changing this field. I searched through the entire file set and the only time the $quantityField is set is in that line in header_php.php.

Can anyone out there give me a bit of direction please??