HELP, out of stock problem on FIREFOX ONLY

[ashkansharifi]

Hi Friends

I wanted to apear "OUT OF STOCK" button same layout as "ADD TO CART" on the product page when a product runs out!

So I have added below code after the "add to cart"

quantity > 0} style="display:none;"{/if}   class="New1"><form action="" method="post" name="form1" class="New1">

</form>

Everything goes just fine EXCEPT that both buttoms apear on firefox!
I tested it on safari, chrome, IE and they are ok
but on Firefox both buttom "out of stock" and "add to cart" apear!!

Please check it from here
http://www.angelic.com.cy/product.php?id_product=11

PLEASE HELP ME
THANKS IN ADVANCE