creating INT0 in PIC18f458

hello...
i write this code for external interrupt..

unsigned int flag = 0;

void interrupt() {
if (INTCON.INT0IF==1)
{
INTCON.INT0IF = 0;
flag = 1;
}
}

void main()
{
TRISA=0x00;
TRISB.F0=0x01;
ADCON1 = 0b10000111;
CMCON = 0x07;
CVRCON.CVROE = 0;
INTCON = 0b11010000;
INTCON2 = 0b11100001;
INTCON3 = 0b00000000;

while(1){
if(flag == 1){
flag = 0;


PORTA = ~PORTA;



}
}
}

its working as when int0 goes high INT comes ,led glows on portA and when again int0 goes high ,it turn off the PORTA..
but i want that LED's goes high only if int0 is 1,when int0 becomes low led should off.

simply ,when then push button is pushed LED's should on
when push button release LED's should off.

You have to then wait for INT to go low in your while loop.

if(flag == 1){
    flag = 0;
    PORTA = ~PORTA;
    // wait for int pin to go low..
    while(PORTB.PB0 == 1); //pseudo code.. replace with exact port pin and nomenclature
    PORTA = ~PORTA; // turn off port again

what is the difference ,when i use INT0 or only if statement..
can you give me example..???

I do not understand what exactly you are trying to ask.