Problem adding product options with Ä symbol

I Have a problem with product options with the Ä symbol. When you choose one option with Ä the "ajax animation" don't appear and you don't know if the product is addet to the cart or not, but if you refresh the site then you can see the product added to the cart (but if you try to see the cart is not showing). An if you try to checkout with this product to the cart, in the step 5 you get the error "SYNTAX ERROR: UNEXPECTED TOKEN"

You can try it here (this is my last update to version 1.5.1.3)

http://www.swi-tec.com/shop/index.php?r ... uct_id=153


In my old shop with 1.5.0 works perfect (I keep a copy here)

http://www260.lx.webinspira.com/shop/in ... uct_id=153

Anybody can help me?


Thanks in advance!

whats the payment method you use to checkout with.

Bank Transfer & Offline Credit Card (qphoria mod). I try to change them but didn't work

I Had to change the Ä fo ae because some clients need to buy this product, but the problem steels there.

Thanks anyway

i can not believe this happens

SYNTAX ERROR: UNEXPECTED TOKEN

only with paypal might something like this be displayed,