Using the tab key to move from cell to cell.
 

I recently ugraded to Excel 2007. I've got a sheet that's protected with just
a few unlocked cells. When I hit the tab key, the cursor moves from unlocked
cell to unlocked cell... but only left to right. It won't move down to the
next unlocked cell. In other words, I want the cursor to move left to right,
then top to bottom... like the way my older version of Excel use to do. How
do I do that?