How to toggle Scroll Lock in Excel 2010 without a Scroll Lock key in the keyboard

I have a notebook with no Scroll Lock key (or any shortcut using the 'Fn' key).

Somehow Excel 2010 got the Scroll Lock on. I see it left down in the status bar and now I can't navigate through cells using the arrow keys, which is pretty annoying. It wasn't turned on some hours ago, so I think I must have hit some Scroll Lock toggle shortcut in Excel 2010 by mistake.

Anyone knows what hot to turn off Scroll Lock in Excel (shortcut or menu option)?

From this link which refers to the Excel help file:

"If your keyboard does not have a Scroll Lock key, on your computer, got to Start, All Programs, Accessories, Ease of Access, and then click On-Screen Keyboard. When the on-screen keyboard appears on your screen, click the slk button."

There is a picture of this process at the link.

It's 'Fn' + 'S', accidentally pressed instead of 'Ctrl' + 'S', which is the toggle shortcut on my Dell - and most Dells, in general.

Also, 'Fn' + 'C' works for HP Elitebook laptops. Try if it works for you.

On an HP Probook 440, function + C locks and unlocks ScrLk.

Scroll Lock option for the Lenovo L 440 Thinkpad can be enabled by using Fn+K to toggle.

Virtual Keypad option as suggested above OSK also works.