Re: How do I read the value selected from a drop-down list?
See a related reply here. Does your form work in an HTML page, but not in a Tiki wiki page? If the script isn't working yet in an HTML page, then your question doesn't appear to be specific to Tiki. Although there's a chance someone with the expertise can help you out here, seems to me you should look for answers at a forum specializing in php/mysql.
-- Gary