inteerupt programming doubt

#include   <pic.h>

void main(void)

{

	int tmp;
	TRISB   = 0b00000000;
	RBPU = 0;      // Use internal pullups
	T0IE = 1;      // Enable interrupt on TMR0 overflow
	INTEDG = 1;      // falling edge trigger the interrupt
	INTE = 1;      // enable the external interrupt
   	GIE = 1;      // Global interrupt enable
	tmp=1;
   	for(;;)
{
      	CLRWDT();   // Idly kick the dog
   }
}

	static void interrupt
	isr(void)         // Here be interrupt function - the name is unimportant.
{
   if(T0IF==1) 
{
	if(tmp==1)
{  
	PORTD=map[i];
	RB3=1;
	T0IF=0;
}
else if(tmp==2)
{  
	PORTD=map[i];
	RB3=0;
	RB2=1;
	T0IF=0;
}

else if(tmp==4)
{  
	PORTD=map[i];
	RB2=0;
	RB1=1;
	T0IF=0;

}

else if(tmp==8)
{  
	PORTD=map[i];
	RB1=0;
	RB0,1;
	T0IF=0;
}
tmp=0;
tmp=1;
}
}