Paypal form for prorated dues

Hello,
We are trying to create a custom paypal form so that new members can pay prorated dues based on the month that they joined. We have the code from Paypal, but when I paste it into the source it doesn't work. Any thoughts?

Here is the page I created so you can see:

www.westconntoastmasters.org/paypal.html

You just need to post the supplied code using the "source" button

The Paypal code can be a bit tricky. You have to build the controls completely using the Paypal provided mechanisms. Be very careful about doing any kind of alterations from what Paypal provides... usually altered controls do not work. For example, if you need to change your dues amounts in the controls that Paypal provides, usually you have to rebuild the controls completely via the Paypal website. (cannot just change the amounts in the controls) Paypal specifically has this set up to prevent hacking by alteration of controls.