You can update that one line of code. Currently it uses mhash, but it is only used in that one place, so you can try updating it to hash or hmac.
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.