still trying to get Authorize.net to work

I'm still trying to get authorizenet_aim to work and am having trouble. This is what the credit card area looks like (without the fill in boxes).

Payment Method We accept: Visa MC AmEx Discover

This is currently the only payment method available to use on this order.
Credit Card
Credit Card Owner:
Credit Card Number:
Credit Card Expiry Date:
CVV Number (More Info)

There isn't anything to choose which card you are using, could this be the problem? I keep getting the infamous declined with no reason message.

for a bit more information, the source code for the credit card choice section lookslike this:

<input type="hidden" name="payment" value="authorizenet_aim" /><label for="pmt-authorizenet_aim" class="radioButtonLabel">Credit Card</label>

<br class="clearBoth" />

Should the input type=hidden?

kjharrison:

There isn't anything to choose which card you are using, could this be the problem? I keep getting the infamous declined with no reason message.
There is no need to specify which card ... the code can determine what credit card is used by the numbers entered.