You don't need any scripting for this, serverside or clientside.
All you really need is an HTML form:
Allthough this will bring up the mail-client on the visitor's machine with all the information in the form already entered into the mail along with your email in the to: field. This is the simplest way of sending info but it can't be used on most public computers since it requires that you have an e-mail account set up on that computer.
I recommend that you look up what type of server-side support your host provides and find a validator script. Those will also send the mail without the need to have a mail client.