My fifth extension, specially designed for *F11*. - yjl

I think it use too much memory, 33-36MB in 1680 screen width. Should dynamically create the canvas. - yjl

Just added 12/24 and HHMM-only modes. - yjl

It can work in firefox now, I made some coding issue with confusing names. But the layout isn't right, still couldn't figure out what cause the strange displacement in Firefox. - yjl