Making a link as described by xhomerx10 would only work for the visitors that have setup their OS to use their wallet to open bitcoin links. All others will just click your link and they'll probably be redirected to an error page (haven't tried this out).
By showing a QR code, and maybe the address to, you'll appeal to people using a mobile wallet, and everybody else can just copy/paste the address..
Just my personal opinion tough
not everybody owns a smart phone to scan the QR code and those who own a smart phone may not even have a bitcoin wallet installed on their phone.
besides if i can remember it right, the first time i installed Armory and it did that automatically without me even knowing it, so when i clicked on the link it redirected to my wallet. i haven't tested it with my Electrum yet!