the date picker is not working due to conflicting vversions of jquery being added.
yoou have a script tag near the top of the page top add jquery:
<script src="jquery.js"></script>
and further down is a tag for the date picker jquery:
<script type="text/javascript" src="webassist/jquery/jquery.js"></script>
<script type="text/javascript" src="webassist/jquery/jquery-ui.js"></script>
only one instance of jquery can be added to the page.
for the validations, you say:
"Some of my form validations are not working"
please be more specific. which ones? server validations? spry validations?
Also, please include a copy of the page.