You're supposed to replace the x with a number. Please read through the link I provided, which explains it in more detail.
You want something like decimal(6,2) as the type.
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.