No head lights in 2000

ok now i am driving a 2000 cav LS

and never had a problem with the lights before last night now all that works (as far as the head lights go) is the two parking lights (the orenge ones) and i the onley i see driveing in the dark is if i pull back and hold it on the high bemes (so the high beams work if i hold it there
normally it would show me that the DRL are on but nope
everything works in side well exceped that little green light in the coner

and yep i checked all the notticeable fusies
they all work
Help please i need to know what the the promble is

ANY ONE???????

go here: http://www.automotiveforums.com/vbulletin/showthread.php?p=1719727