Sorry, prev code is incorrect.
Here is correct code:
precode
var popupLayOut = '<div data-role="popup" id="popupBasic"><p>This is a completely basic popup, no options set.<p><>';
var popup = jQuery(popupLayOut);
jQuery("body").append(popup);
$("#popupBasic").popup();
$("#popupBasic").popup("open");
/code/pre
Regards.