Blocko

Hey guys, I plan to go as Mega Man for Halloween. but I need a bit of help making his mega buster arm gun. I have a bit of electronics experience but nothing on this level before. Basically what I would like to do is stick about 40 or so LED's inside the bottom of a 1L pop bottle the inside 10 would be solid on/off with a button press. But the remaining 30 I wanted to do a sort of 'Chasing light' effect to make it look like it was charging up for a more powerful shot. This would be on a separate button. I've attached a picture of what I'm thinking: The inside 10 I know how to do just fine. It's the outside 30 that I'm have trouble trying to figure out. I know I'm going to have to use an IC of some kind to control the timing but I have no idea which IC will do it or what else would be required in terms of controlling the flash rate, power consumption, etc. Can you guys help me out with this? Make mock up a quick schematic? If there is a way to do it without having to program a PIC or something that'd be ideal. Thanks.