Up and down arrow keys do not work

Hi Guys...I need your help...
Since my arrow keys (only up and down) do not work anymore on my iMac (Mac OS X 10.4.11)...No matter in which application...
I have reset the PRAM since I thought that this may solve the problem without any success...does anyone have an idea how to resolve this problem?
Have I maybe pressed any shortcut by mistake, which can lock these keys?? It is a pain to work without these 2 keys
Thanks in advance for the help

You may have switched on [http://kb.mozillazine.org/accessibility.browsewithcaret caret browsing].
You can press press F7 (on Mac: fn + F7) to toggle caret browsing on/off.
See http://kb.mozillazine.org/Scrolling_with_arrow_keys_no_longer_works
* Tools > Options > Advanced : General: Accessibility: [ ] "Always use the cursor keys to navigate within pages"

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