Considering that you already have a webspace, it's kind of silly to not use a server side language which provides you with absolute control of what you do with the submitted data (process it, validate it, mail it to yourself etc.) Plus a Javascript solution would mandate that the user has a mail client installed which would definitely be an expensive assumption.

The best way here would be to go with a server side solution. PHP isn't that difficult of a language and it's always nice to have a good reason to learn something new. :-)