With a macro or a shortcut key trigger, I'd like to scroll the page up or down, with respect to the current cursor position, such that the cursor shall always be displayed at the center of the screen(the cursor doesn't move at all, just the page).



For example, if the cursor is position at the bottom part of the screen, the page is scrolled down to the point that the cursor will be centered at the middle of the screen. However if the cursor is position at the top part of the screen, the page shall be scrolled up to the point that the cursor is centered at the middle of the screen.

Can it be done(without using the mouse to move the scroll bar up and down)?