I want to build a kid's play and learn apps for firefox OS. The feature of the apps as follows 1) The apps will display .png image one by one on every trap on the image. 2) After the Image come on the screen a audio file will be played so that kids can identify the object of the image. 3) After display of the end image file the first image will be loop back. Condition: ======= The apps has two part one is apps code another is apps data (image & audio). As my firefox phone has very less amount of internal flash so it is decided to stor the apps code into internal flash and apps data into external sd card. On external sd card there will be a folder namely “kidsplaylearn” and inside the folder image & audio files are stored. For a object two files will be there one for image and another for audio. As example for dog.png & dog.wav. On start up the apps will make a list of png files available in to the folder extsdcard/kidsplaylearn and loop through the list. Help required: ========== 1) How to make list of png files available in to the folder extsdcard/kidsplaylearn 2) How to display image from the above list. 3) How to play a wav audio file which is stored in a sub folder of extsdcard. Not sure is it the right place for the post. If not please guide me where to post. Regards jags