multitasking in mikro c for pic

[ugurvar]

hi!
i want to design a led circuit.
but,it is with problem...

RB0=1;
RB1=0;
these are flasher...(as flip flop)OK!!!
but
RB2=1;
and delay_ms(1000);
later
RB2=0;
but later all of them are waiting about 1 s...
i cant do multitasking!!!