title: jQuery Mobile popup that doesn't move when scrolling the page
body: <p>I am using jQuery Mobile 1.3.0 RC1. I have a popup that I create programmatically at the bottom of my page and close after a few seconds using setTimeout (toast notification). It works very well, however if I happen to scroll the page while the popup is displayed, the popup gets scrolled too. I would like the popup not to move, i.e. stay in its position relative to the screen, not relative to the page. Is there a way to do that ?</p>
  
  <p>I have tried playing with the data-position-to attribute in the HTML element, with the positionTo option of the "open" method, and tried placing the popup element inside a fixed transparent footer, none of these resulted in the desired behavior. </p>