Passing Arguments

Hello. I have a php file that accesses my mysql database, displays some of the database data in <select> lists, along with some other listings. This all works great. What i want to do now is take some of the arguments that are selected and update the sql database with those values. What i dont understand is how I am going to pass these selections to a second php script in order to do the mysql statement there. So, i guess my question is two part: 1. Is there some way to use the submit button on the same page to do an update command, OR 2. How do i pass the arguments to another php script where i do know how to do the new mysql update command. Thanks in advance! tom