email certain people

I am making a webpage, and I want to be able to email certain people that are selected by a checkbox when I click the submit button. I am trying to figure out what the best way is to do this. There are four people on the page and they each start with their name checked (so they should receive an email when I click submit). How would I go writing a script to check if these "checkboxes" are marked and then emailing each person??? Thanks for any help!