saving levels

I have a game with 10 levels

I am developing for blackberry Playbook

if a player is at level 6 and exits the application "game"

as I can do for you when you return the player to the game

continue at level 6 and not have to repeat all the levels again

You can use WebStorage to save the current level.

As each level is attained/unlocked, save the new value. When you start the game, read the level from WebStorage and load the right level.

WebStorage Manual

Webstorage is probably the best method to use. You can store all sorts of variables as local keys in webstorage, or you can save an entire array as a string in webstorage.

Saving Variables to Webstorage

Saving and Loading Arrays to Webstorage

but I would like to angribirds style menu levels

I export the game in html5 may have a problem because they do not use PhoneGap