I would like to intercept and modify keystrokes entered into a textbox. I can intercept them with the KeyPress event and I can then write the modified text into the textbox.value. However after leaving the KeyPress event the original key's value is also placed into the textbox. It isn't sufficient to just replace the original key in the keyboard buffer with the new value as I want to place the new value to the left of the existing characters in the textbox. How can I inhibit the original keystrokes?