jquery mobile - Unable to show config screen as dialog -

i have html file called config.html lives in same directory index.html.

the idea load config on startup of app , pop config screen if config's not set. want set config , jump app continues run normally.

here method:

function _showconfig(callback) {   jquery.mobile.changepage("config.html", { transition: "pop" } ); } 

when run this, executes line, appears loading config screen briefly before whole thing vanishes.