Certain years (up to 2000 IIRC) you can just remove the fuse. There should be a fuse diagram on the inside of your fuse box (inside the glovebox).
On later years, you have to unplug the DRL diode. Pry up the panel on the driver's side of the dash (can only be seen with the door open). Underneath, there's a black box with a huge metal fins/heat sink. This is the DRL diode. Use a small screwdriver to push the tab, and disconnect the plug that does into it.
Edit: Try pulling the fuse first. If you have a later model year, you'll hear incessant clicking under your dash. If this is the case, reinstall the fuse and unplug the diode.
