Accessing FileMaker data in Javascript?

[erostratus]

Hello,

I really don't know if this is even possible, but I thought I'd ask. I have an XSLT page in which a user enters an ID number and selects a checkbox for an available time slot. When the user hits the submit button, the page runs a javascript to make sure the user has entered an ID number and selected a time.

However, I want to be able to verify that 1. the time slot selected is available (meaning I want to see if the FMP field is empty), and 2. I want to verify that the user ID matches the value of another FMP field. I have no idea how I can get a FMP field value within a Javascript. Is this possible? I think what I'm really asking is whether there is a syntax that allows XML data in a Javascript.

Thanks for your help!

Tom