I eliminated all the extraneous stuff from my page - leaving just the input box and calendar selection - and still it works in IE and not Firefox. Here's that code:
From the error console:
Error: NewCssCal is not defined
The calendar I'm using is from here:http://www.rainforestnet.com/datetimepicker.htm. I placed the test page they provided on my server - the same problem exists there too.