you should contact the host and have them enable the mhash() library on the server. that library defines the mhash function and the MHASH_MD5 constant that are being used by this code.
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.