My facebook won't work !!

Hello,
My facebook doesn't work. All the other sites are working fine,but not my facebook. Its been going on for 6 days!
the main facebook page works fine, but as soon as i put in my user name and password and press enter, it gives me a can not connect to server page ! i use facebook on campus and it works just fine !
but here in my apartment it suddenly doesn't work !!
some plz help me