No actual "box" is necessary. It is a virtual box that you set up by setting the image width and hieght, no div or other element is necessary.
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.