want to ask is a piece of code image based on the current computer time automatically replace the code
For example, 12 to 15 points 1 16-20 points for the picture for 2 other time pictures 3

Then there is a problem of page is not updated in real time unless manually refresh to see change
Do I want to give you a timer to code has been executed
Or let the browser force refresh?
I don't feel very friendly,,

The small white please code, thank you for your great god