I would use an int column, default value of 0 to indicated unchecked. Then in your PHP code, if the box is checked set the value to 1, set to 0 for unchecked.
-justin
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.