How can I map key for X window program?

How can I map key for X window program? For example, I want to map "j" to "page down" key for acroread program on Linux. I think maybe there is some program can do such x window keyboard event mapping.
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bert [Entry]

"You could write a script to modify the keys with xmodmap when you start acroread (and change them back once acroread has closed.)

For example

#!/bin/bash

xmodmap -e ""keycode 44 = Next""
xmodmap -e ""keycode 45 = Prior""
/usr/bin/acroread
xmodmap -e ""keycode 44 = j J""
xmodmap -e ""keycode 45 = k K""

Instead of running acroread directly, you run this script."