gistfile1.scala

   def buynow(xhtml: NodeSeq): NodeSeq = 
      <form name="_xclick" 
            action={PaypalRules.connection.vend().protocol+"://"+PaypalRules.mode.vend().domain+"/cgi-bin/webscr"} 
            method="post">
        <input type="hidden" name="cmd" value="_xclick" />
        <input type="hidden" name="amount" value={amount.toString} />
        <input type="hidden" name="currency_code" value={PaypalRules.currency.vend()} />
        { values.-("amount","currency_code","cmd","submit")
            .map(x => <input type="hidden" name={x._1} value={x._2} />) }
        <input type="image" src={PaypalRules.button.vend()} name="submit" alt="" />
      </form>