> Maybe my browser is just not displaying things right. Yah, there should be a slider... Initial view shows left half of the area from before, right half from

> Maybe my browser is just not displaying things right. Yah, there should be a slider... Initial view shows left half of the area from before, right half from after, and you drag the slider to change the ratio. You might want to reconsider your browser choice if it also failed to display the "how to use" instructions at the top right.