Javascript and HTML5 memory game for mobile device

This a memory game I'm building using jQuery Mobile. Players are presented with icons with a unique letter or number on them. The icons are randomly placed on the screen, and after a short duration the the letters/numbers disappear from the icons and the player must click the icons in alphabetical or numerical order to advance to the next level. Each level increases the number of icons that the player must order (or level can be set to repeat), and more time is given per level (which is adjustable). Can also be numbers only, alphabet only, alternating, or random.