headliner falling down, how do you make it stick??

my headliner fell down in the back area a couple weeks ago. after not paying attention to it the wind(i always have my windows down) flapped it very loose and now i cant even see out of the rear view mirror . i tryed useing superglue, elmers, and some other contact adheasive, none of it would work. by not working i mean it wouldnt stick. anything would help at this point. also the whole reason that it was falling down in the first place is i think i have a small leak somewhere, i think it is comeing in from the sunroof area but arnt there supposed to be drains for that.

thanks