Hello,
My bid is for implementing it in Javascript, it should be a quick one. However, please note that if Javascript is disabled in someone's browser then your site will load in the frame. To avoid this you should ideally go for a server side option. Which language is your website written in? I can give it a try to implement it in server side for $50. However, I will need access to your server for that...I'll be able to confirm if I can do it. Obviously, if I can't do it on server side then you don't have to pay me anything.
Best regards,
Swagata