Adding a new page into the checkout process

[powersbyname]

Dear All
I am trying to add a new page into the checkout process. The new page will be a custom page with a specific product with a variable price entered by the customer.
I want to add this in before the payment page but after the shipping address page.

I am not show how to change the checkout page flow or add in this single product using my own HTML.

Any ideas of how to go about this would be most helpful

Thank you

Simon

[mazhar]

You can place the custom code inside the OnPaceCheckout control by warping it inside some panel. In fact shipping and payment information both exist on different panels and in order to move customer from shipping screen to the payment screen OnePageCheckout toggles the display of these panels. You may provide some code to adjust and make your custom information available within this wizard by customizing some visibility toggling code.