Disable automatic screen lock in XFCE in Centos

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http://unix.stackexchange.com – I have a generic install of Centos 5.8 with XFCE 4.4. Pretty much all defaults. As it is after a certain amount of idle time, the screen locks (goes black, requires a password to continue). How do I disable the automatic screen lock? I've searched around and read suggestions to use the settings manager to modify the Power Manger or Screen Saver settings but neither of those settings managers/panels/icons are installed on my desktop. (HowTos)