How to save and submit the list in sharepoint 2010

Hi All,

    I have a New Item form, in that I have 2 buttons (one is Save and another is Submit) when i click the save button it should save it to a temporary list but when i click submit button it should save in to a actual list.

here i need save button because, user fills some fields of the form and the rest of the fields he planned to fill on the next day ,so the save button should save the incomplete form data and the next day when the same user sign in and browse to that form the that incomplete data should be present on text boxes of the form ...

Thank you.