hardware interrupt on arduino mega2560

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i trying that:
http://arduino.cc/en/reference/attachinterrupt
quote
the arduino mega has additional four: numbers 2 (pin 21), 3 (pin 20), 4 (pin 19), , 5 (pin 18).

is there has ever used int2, int3, int4 , int5 on arduino mega2560?
because don't work should on arduino mega2560, , can't understand why... int0 , int1 work well, other hardware interrupts don't work...
is there problem on library? or on arduino? or think problem?
thank helping! ;)



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