I recently launched a website and in the Contact Us section I have a lot of ways for people to contact me. There are buttons for Skype, Google Talk, MSN, Yahoo, and AIM for example. To complete the contact information I'd like to have a button for people to contact me via iMessage. I know I can simply put something such as "Contact me via iMessage" and then put my ID behind it but I'd like something as simple as a button where they can click on it and then it'll bring up their Messages app on their iOS device or on their Mac so that they can start typing a message to me.
Is there any type of button such as this available?