hi andi;
you can set a flag for both interrupts.in your main program check for them and take action.

e.g.
int0_isr:
setb x
;do critical part.
reti
int1_isr:
setb y
;do critical part
reti

main:
jbc x,int0_process
jbc y,int1_process
sjmp main
int0_process:

int1_process:

if you feel that there can be more than one interrupts of same kind while you are busy processing other then instead use a counter that increments in isr and decrements in main code.
pranav