The menus should work with all modern browsers. If JavaScript is not available or is turned off, then the website should still work great, only without the new menus.
To create these menus, we used DHTML Menu Builder, which can be found at
http://software.xfx.net/utilities/dmbuilder/?cse
I recommend the above program if you want to add JavaScript menus to your website.
Also, we have a recommended resources page that has recommendations for services and other software. You may find something that is useful to you, so feel free to take a look.
http://www.htmlvalidator.com/htmlval/resources.html
