Accidentally lost your show desktop icon in windows XP?  Here’s how to get it back.  Open a text document in notepad and write the following:

[Shell]
Command=2
IconFile=explorer.exe,3
[Taskbar]
Command=ToggleDesktop

Save the following file as “Show Desktop.scf” and drag it back into the quick launch toolbar. That’s it!

More:  The Quick Launch toolbar uses the files in the following folder:
%userprofile%Application DataMicrosoftInternet ExplorerQuick Launch