Can I add fog lights to my 2007 Equinox?

I have a 2007 Equinox and my wife really wants the fog lights.  I know where I can get those but I do not have the fog light switch on the dash that goes with them.  I also do not know if the wiring is already there or not.  It appears that the fog light switch is connected to the two switches next to it so since I do not have the switch will i have to replace the entire switch block or will I need to simply add the fog light switch?