Get value from AJAX using Javascript and ASP
Client-side Javascript can't query server-based databases for obvious reasons. Based on what you appear to be doing, I would suggest you code an ASP which performs the actual query using VBA / C# / whatever, and you can then parse the results in your client-side ajax call as normal.
URL encode _data and nbquestions variables. Request.QueryString("param1") will decode them for you.
JavaScript URLEncode:
escape(_data);
Also you can use Server.URLEncode() methods from VB script.