[SOLVED] multiplexing of 7 segment display with 8051

hi everybody.i hv a problem with my code.it is a counter prgrm.i hv 2 calculate like 99,98.........00 bt it is giving o/p like 9(1st display),then it goes off n then 9 on 2nd display.m using ATMEL 89C51 controller n using keil compiler.my code is


#include<reg51.h>
sfr disp_val=0X90;
sbit ds1=P2^0;
sbit ds2=P2^1;
void system_init(void);
void delay(void);
void dec_seg_1(void);
void dec_seg_2(void);
void dec_both_seg(void);
void disp(void);
void segment(void);
unsigned int val_1,val_2,z,cnt;
unsigned char arr[]={0X3F,0X06,0X5B,0X4F,0X66,0X6D,0X7D,0X07,0X7F,0X6F};

void main(void)
{
cnt=0;
TMOD=0X01;
TL0=0x00;// Timer value for interrupt is 1ms
TH0=0x00;
IE=0X82;
TR0=1;
while(1)
{
system_init();
}
}

void system_init(void)
{

val_1=9;
val_2=9;
segment();
}

void segment(void)
{
do
{
disp();
dec_seg_2();
}while(cnt>0);
}

void disp(void)
{
ds1=0;
ds2=1;
z=val_1;
disp_val=arr[z];
delay();
ds1=1;
ds2=0;
z=val_2;
disp_val=arr[z];
delay();
}

void dec_seg_2(void)
{
val_2--;
if(val_2<0)
dec_seg_1();
}

void dec_seg_1(void)
{
val_2=9;
val_1--;
if(val_1<0)
dec_both_seg();
}

void dec_both_seg(void)
{
ds1=ds2=0;
z=0;
disp_val=arr[z];
main();
}

void delay(void)
{
//for(i=0;i<=40;i++)
//TMOD=0x10;
TH1=0x4B;
TL1=0xFD;
TR1=1;
(while TF1==0);
TR1=0;
TF1=0;
}
/*int i,j;
for(i=0;i<itime;i++)
for(j=0;j<1275;j++);
*/
}

void timer0() interrupt 1
{
cnt++;
}