jQuery Validation – Multiple submit buttons on one asp.net form, different validation groups?

I have an asp.net form with a login section and a register section. There are two submit buttons that correspond to the appropriate section, login or register. I am using jquery validation, however I cannot find a way to specify validation groups as I would with normal asp.net validation. When I click the register button, right now it is asking for the login fields to be filled in. Anyone have any thoughts on this? THANKS!

How can I prevent a page to jump to top position after failed validation?

I have a simple aspx page with a few TextBoxes and a submit button. Some fields are required and below the button is a ValidationSummary. The complete form is larger than screen height so one has to scroll down to reach the submit button. If I don’t fill all required fields and click on submit validation fails as expected and the validation summary displays some info messages below the button. Validation happens on the client and no postback occurs.