I went to the link specified and the only errors that I could see reported were coming from your css files and there were some missing } curly brackets in there.
I did not see an error on your page relating to the dynamic dropdowns. Please explain a little about the steps you have taken to implement the dropdowns and the result you are getting now and if you had them working before. Also, let us know if you encounter an error exactly what the full error message is and when it occurs for you.