Insert a checkmark by selecting a cell, remove checkmark by deselecting the cell.

Instead of drawing border around a cell, why not insert a checkbox from the forms menu. It acts in the manner you wish to employ.

http://office.microsoft.com/en-us/ex...010236677.aspx

Alan

1 Right-Click on a blank area of the menu area
2 On the list which appears click on Forms
3 Click on the CheckBox in this Forms toolbar.
4 Off the toolbar the mouse turns into a hair-cross
5 Click where you want the CheckBox to appear
6 Drag the shaded outline to position it accurately
7 Right-click within the shaded area but not in the checkbox
8 In the context menu which appears select Edit Text to change or
remove the text, dragging the shaded outline to size it.
9 In the right-click context menu (as in 7- select Format Control
10 Select the Control tab
11 Set the initial setting of the control box
12 Click in the Cell Link entry box, then click in the cell where you
want to place or receive the checkbox status
13 Click OK on Format Control