change the URL a form posts to

I have a custom registration block that displays a form on the homepage. My form outputs correctly when I call drupal_get_form('myblocks_register') but the form wants to post to mydomain.com/node (which is my front page) instead of mydomiain.com/user/register

How to I alter my form to post to /user/register instead of /node?

By the way, my goes is to display a registration form on the home page that only shows the two required fields I have, username & password. The goal is to allow for a much faster signup process.