well... you need to say a bit more to get a better answer probably...

"content of selection" - do you mean the VALUE attribute of the select element? If so then you don't need AJAX call at all.
...

I have don't things similar to this on sites with JavaScript - but not using a select element.

Basically - I Show and Hide <div> container - which itself holds an Unorderd List <ul> element with...

Your problem description is quite specific - but ultimately what you are talking about is some type of form validation.

Generally form validation falls into two categories:

1. things you can...

This is just more proof that jQuery truly is one of the most awesome things on the web! The new website is alot better -- and jQuery UI is a big help too. I am so glad I jumped into jQuery about 18...

JavaScript is an open standard - known as ECMA script. There are some differnces in browser implementations, but it is still far more universal and open than VBScript.

Ok... first one to rule out is FLash - it is heavier to load, you need proprietary tools to maintain it - and it is more difficult to integrate with other technologies on your page.

CSS or...

Well either way - if you can - try to get your data into the following format - I recommend downloading a JavaScript array of the countries (which will be smaller) - to your page - and then using...

I assume you are using two <select> elements for your lists...

The first issue - is how is your data stored? IOW - for each country - how do you acquire... the list of states? Is it is some sort...

You can also use PHP functions to create a link - this may be better than hard coding the URL so that you can keep the URL relative to the base of your web application.

Hope that helps!

I think datetimepicker should have it's own custom onchange event callback - so I would use that instead of trying to use the onCHange on the form