I know I've seen it done before but I'm at a loss on how to do this:

Without using the control toolbox, I want to format cells that will appear with an 'X' type of mark in them when clicked on by the mouse.

I have a spreadsheet that has about 30 different choices for a given person; each person will have a different number of boxes checked and the easiest way for me to input the person's selections is to simply click my mouse on the appropriate boxes.

Also, does anyone know how to make the active cell move to the right when pressing ENTER rather than down?

Any input on this is much appreciated....