In his Siebel Essentials blog, Alexander Hansal explains how to create a popup screen using the new UI and uses Google Maps as an example. He writes:
"I thought it is worthwhile to shift gears and do a customer info popup in Siebel CRM. Here is what my prototype looks like:
As you can see from the screenshot above, the popup dialog displays a Google map, the account address, location and a link to the company website. Behind the top left corner of the dialog you can spot the Opportunity Account control and the label in orange color (which I choose to make it stand out from the other labels which don't offer the functionality).
As usual, I am going to explain my approach to implement it. "
You can read more at jQuery UI Widgets in Siebel Open UI - Part 2: More Dialog