Using the jQuery Mobile framework we can easily create a dialog pop up modal window that presents the content of one of our pages. The third topic in my jQuery Mobile on going course covers this possibility. You can download the slides of this topic and watch the video clips available below. I believe they will assist you with developing your first dialog windows.
The professional version of my jQuery Mobile course is available at www.xperato.com. The community version is available for free personal and academic usage at www.abelski.com.