Im using 4 inputs of a at89c52 (p3.2 to p3.5) to drive 4 different led sequences coming from p1, the problem is im using for loops to do the sequences but if i select a sequence when another one is still running it wont work. How can i break the sequence and continue with the one i selected. Heres part of my code using just 2 sequences:

while(1)
{
while(P3_2==1);
delay(50); //delay to debounce
for(i=0;i<12;i++)
{
P1=~tled1[i];
delay(75); //flashing sequence
if(P3_3==1) //exit to other sequence
break;
}

while(P3_3==1);
for(i=0;i<12;i++)
{
P1=~tled2[i];
delay(75); //flashing sequence
if(P3_2==1) //exit to other sequence
break;
}

}