Submit form cross domain?

I want to create a simple web form on my website that will POST or GET form field values to a different domain. Ideally, the form will just have it's action set to match the other domain's form action attribute. I'll then just match my form to contain the same fields and submit it to the other site's form processor.

The other site's form fields have a lot of fancy JS effects (e.g. calendar, etc.). I don't want any of that on my form. I just want my form to be plain vanilla HTML.

The other site's form is an ASP.Net form, so it has a bunch of fields that I don't think I can predict are going to be. I think that might cause me some problems.

Is this something I can do with a high degree of reliability? If so, what approach or tools can I use? Is it as simple as just identifying the form fields and mirroring them? Will ASP.Net forms cause me problems? If so, how do I get around that?