Worldpay allowing customer to enter payment account

[paulsmith2010]

I want customers to be able to type in an amount (outside actinic?, as actinic can't handle it) and this go off to worldpay. The following is the form but the "amount" value needs to be populated with javascript. I don't really know how to do this so can anyone help???

<form action="https://secure-test.wp3.rbsworldpay.com/wcc/purchase" method=POST>
<input type=hidden name="instId" value="installation id">
<input type=hidden name="cartId" value="customer_entered_price">
<input type=hidden name="amount" value="">
<input type=hidden name="currency" value="GBP">
<input type=submit value=" Pay This ">
</form>

There are some examples at http://www.rbsworldpay.com/support/b...=examples&c=UK

[Mike Hughes]

Actinc can handle it.

Create an item at 1p then let the customer enter the amount they want to pay in pennies as the quantity.

Or you can do the same thing in pounds.

Mike