How can I disable Expose?

Pardon my ignorance but I'm new to the Mac world. I want to use the keyboard shortcut <Shift+F3> in my text editing software to toggle the ChangeCase command but this combination seems to have a life of its own - it activates Expose even though I have disabled Expose in the System Preferences.
In the Expose Preferences, I tried two different tactics - first I left the activation keys blank (with the hyphen) but this failed to stop <shift+f3> from activating Expose. So then I tried assigning other keyboard shortcut keys to Expose in the Preferences. Still no joy - <shift+F3> still activates Expose. Where is this association between <shift+F3> and Expose being made if not in the Preference pane?
I have gone through the entire list of Keyboard shortcuts which is listed in the Keyboard Preferences, and have eliminated F3 wherever it was being used by as a shortcut for another application. But to no avail! It is like <shift+F3> is hardwired to activate Expose. I really don't want Expose at all - I could uninstall it for all I care. How can I control <shift+F3> and assign it the action I want? Just going to the System Preference Panes is not working for me.
I do a lot of text editing, and I have become habituated to using the <shift+f3> function for changing case. Both of my text editing programs use <Shift+F3> for the ChangeCase command. It's driving me crazy that I can't make it stop activating Expose. What am I missing here?

Yes, you are right - the keyboard has a picture of Expose on F3, so I guess it is indeed hardwired. I tried your suggestion of selecting the "use Fkeys as standard keys" option in the keyboard preferences - this works with Microsoft Word but not with Open Office text documents. But I am happy, now at least I have one program that works like it is supposed to! Incidentally, there are two sequences which are hardwired into the Apple USB extended keyboard F3 key - a slow Expose and a fast Expose. With the Preferences set to "use Fkeys as standard keys" as you suggested, the slow Expose is hardwired to <FNshiftF3> and the quick Expose is hardwired to <FN+F3>. but now they don't bother me. thanks for the quick and helpful reply! Now I can CHANGE Case with IMPUNITY!

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