auto-select a subscription option in the drop down menu

[AmazingRibs]

My client's site is only accessible if a paid member, there is only one option for subscribing, yet the drop down list says "Select" then the user has to selection the option. We'd prefer just have it selected already. When I put "select='true'" and the option is auto selected the form to select payment method doesn't show. I tried hiding the select, auto selecting it and displaying the payment options form but it's not populated with the subscription options. I'm guessing there's some behind the scenes ajax going on that populates the options form when the user selects but I can't seem to find it.

Any help?