i never look up when im in my car, and the other day when i did, i noticed the carpet is starting to pull of and hang down like it does on older cars, its a patch about as long as a footlong sub right next to the bar runnin down the center of the car...how can i fix this???? thanx to everyone for their help...

 

Carpet is on the floor, the headliner is on the roof.

An upholstery shop can fix it or you can get a new headliner panel (~$80 wholesale). If you think you can do it yourself, you can get material and spray adhesive and redo it. Stick a few shirt pins in it, so it won't get any worse.