[popup] Correctly use the body for the closest page, if no closest page found
[popup] Correctly use the body for the closest page, if no closest page found

This makes it possible to share the popup among several pages.

arschmitz/jquery-mobile,hinaloe/jqm-demo-ja,startxfr/jquery-mobile,npmcomponent/cbou-jquery-mobile,arschmitz/uglymongrel-jquery-mobile,startxfr/jquery-mobile,hinaloe/jqm-demo-ja,npmcomponent/cbou-jquery-mobile,arschmitz/jquery-mobile,startxfr/jquery-mobile,arschmitz/uglymongrel-jquery-mobile,arschmitz/jquery-mobile,npmcomponent/cbou-jquery-mobile,arschmitz/uglymongrel-jquery-mobile,hinaloe/jqm-demo-ja