Hi Justin,
My advice is to as soon as possible use a server side script for your emails. Your page is a sitting duck for spammers if they have not already harvested your address, its there for all to see.
There are heaps of free scripts available.
A simple one is Sonic Contact : SonicContact | SonicFog Web Development | Contact, Strategies, System, Website, Features, Phpmailer
Im sure someone will offer other script suggestions.

Regards