IE8 Compatibility Mode and datepicker

IE8 Compatibility Mode and datepicker


I'm using jQuery 1.3.2 and jQuery UI 1.7.1. When I view my site in
IE8, my datepicker doesn't work until I put IE8 in "compatibility
mode".
Here is my doctype on my document:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
My pages validate at the W3C online validator as valid xhtml. I
believe my webserver is serving them with a content-type of text/html
in the headers.
The datepicker works in the latest versions of Firefox, Opera, Chrome,
and IE7. Any suggestions?
Thanks.