18 Jul 2012
30 Nov 2012
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I'm not sure if I'm understanding you correctly, but it is possible to create a user control (.ascx) that has a button where you can set the PostbackUrl to match the url of that form on the page (https://customer.cngc.com/login.action). Then you simply make sure that the input textbox names match the ones in the form ("username", and "password" you can enforce this by setting the Client naming to "Static") so that it submits those values properly to that url
I'm not sure this is best practice tho, because you are essentially logging into one site from another, and I'm pretty sure that's not recommended.
but I hope this is helpful!