want to make slider button transparent

[txter]

im running adyns cf30 3.0 vanilla. having s2u built in is pretty cool. what i would like to do is make the slide button at the bottom of the screen transparent. this way people cant see how to unlock the phone. i would like to keep the same funtion as the button. you would just have to know where to slide your finger to unlock it.
being that s2u is built into rom, can this be done?
i tried looking through the windows folder for a min to see if i would see anything but i didnt. i was looking for a .gif, .png, .jpg.

any ideas?