"previous screen and next screen" shortcuts

Sometimes you end to click and move out of a screen and loose the focus on what you were doing in the previous screen.

Going back to that previous screen ask the player to know the GUI shortcut by heart, clicking on 2, 3 or more shortcuts to go back to what he was doing.

A "previous screen / next screen" shortcut, like the "previous / next page" shortcut you have on an internet navigator, would help a lot.

I personnaly would love to map those shortcuts on mouse 4 and mouse 5.