The get method will pass data from form fields through the querystring whereas the post method will send the data to the server in headers that only a server-side script will be able to process. If you're not working with any server-side script (as is implied by the .html extension on your file) then you will have to use the get method as ray said.
When information is passed through the quearystring it will appear as follows:
Edit: To get the information back on the next page you'll need to parse the query string and split the string about the & symbols. That will get you some name/value pairs, then you could split them about the = symbol to separate out the name and the value. I'll write a function to do that and post it in a bit.
Another Edit: Scratch that, I found a script that someone's already written. :p