Paypal credit card payment with Paypal checkout HTML button -

i met issue w/ paypal checkout html button when want "check out guest". on paypal checkout page:
- click on "check out guest"
- fill required fields
- deny paypal account creation
, when click "pay now" button, nothing happens (no error, no form submit)

anybody ever encountered kind of problem ? ideas ?

thanks in advance

paypal checkout html button code sample

<form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top"> <input type="hidden" name="cmd" value="_xclick"> <input type="hidden" name="business" value="xxxxx"> <input type="hidden" name="lc" value="fr"> <input type="hidden" name="item_name" value="buynow"> <input type="hidden" name="amount" value="1.50"> <input type="hidden" name="currency_code" value="eur"> <input type="hidden" name="button_subtype" value="buynow"> <input type="hidden" name="no_note" value="1"> <input type="hidden" name="no_shipping" value="1"> <input type="hidden" name="rm" value="2"> <input type="hidden" name="return" value="xxxx"> <input type="hidden" name="cancel_return" value="xxxx"> <input type="hidden" name="tax_rate" value="0.000"> <input type="hidden" name="shipping" value="0.00"> <input type="hidden" name="bn" value="pp-buynowbf:btn_paynow_lg.gif:nonhosted"> <input type="image" src="https://www.paypalobjects.com/fr_fr/fr/i/btn/btn_paynow_lg.gif" border="0" name="submit" alt="paypal, le réflexe sécurité pour payer en ligne"> <img alt="" border="0" src="https://www.paypalobjects.com/fr_fr/i/scr/pixel.gif" width="1" height="1"> </form>