Hi,
I believe DatePicker uses z-index in the 30000 (30K) range and there is no public API to change it. It was changed to 300000 (300K) range since version 2009. The changed value should work for you.
The change may already exist in the latest 2008 build, so try that first (we will PM the download location of the latest 2008 build). If it does not work, you will need to either update to 2009 or manually modify the script file for 2008. Follow these steps to manually modify script file for 2008:
1. Turn on physical JavaScript file. See the following link for details (look for "Physical script files"):
http://doc.essentialobjects.com/library/1/installationanddeployment/deploy.aspx2. Search for "return 30000" in the js files. You should only see one occurrence. Change that to a higher number;
Thanks!