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how to glow a led using interrupt

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i_chaitanya

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hey guys !!
what i want to do is i want to glow LEDs (lets say connected to RB4-RB7)
i have a switch connected to RB0 pin
when i press the switch an interrupt is to be generated and the LED should glow
all the LED should glow simultaneously
it will be very helpful if anybody could help me with the coding
thanks in advance:!::!:
 

Code: 
#include	<htc.h>
#define RELAY RB4					
static unsigned int	relay_timer;	

void main(void)
{
	/* setup stuff */

	RELAY = 1;		
	//TRISB = 0x03;	

	OPTION_REG	= 0b11000111;
	TRISB	= 0b00000011;

	//RBPU = 0;		
	T0IE = 1;		
	//INTEDG = 1;		
	INTE = 1;		
	GIE = 1;		
	for(;;){
		CLRWDT();	
	}
}

static void interrupt
isr(void)			
{
	if(T0IF) {				
		PORTB ^= 4;
		if(relay_timer){
			relay_timer--;	
			PORTB |= 8;
		}else{
			RELAY = 1;		
		PORTB &= ~8;	
		}
		T0IF = 0;			
	}
	if(INTF) {				
		RELAY = 0;			
		relay_timer = 16;	
		INTF = 0;			
	}
}





here is a code can any body explain me what is happening in this code
equivalent proteus snapshot or any other schematic will be highly appreciated
 

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