hmmm, could you explain it more? i have no idea what you're asking, but here's something i made anyway. i think this is too simple to be what you're asking, though, so clarify and i'll try to help
edit:

haha, yeah, i realized that this IS too damn simple, but it's something to work with...
second edit: going with what the guy whose reply is below this, think of the question mark as a variable........y