Problem in externa interrupt in 16f877

[ecaits]

I want to use external interrupt in pic16f877 but cannot get the interrupt. Code is given below.
Why it is not getting ???
I am using switch on RB0 pin and want to toggle the RB1 pin connected with LED.

Plz support.

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Code C - [expand]
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#include<htc.h>
#include<pic.h>
 
void main()
{
    TRISB0=1; 
     TRISB1=0;                    // Configure PortD as output port
 //   INTCON=0x90;                  // Enable INT0
//    INTCON2=0;                    // Set Falling Edge Trigger for INT0
GIE = 1;
INTE = 1;   
OPTION = 0x40;
 //   INTCON.GIE=1;    // Enable The Global Interrupt
    while(1)
    {
   //     LATB=0x55;       //Set some value at PortD
    }
}
 
void interrupt ISR(void)              // Interrupt ISR
{
    if(INTF==1)
    {
    INTF=0;          // Clear the interrupt 0 flag
    RB1=~RB1;  }             // Invert (Toggle) the value at PortD
  //  Delay_ms(1000);           // Delay for 1 sec
}

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[cl10greg]

What IDE and compiler are you using? Have you tried putting the interrupt above the main function? I am not sure if you need that OPTION call, I don't believe I used that before when I did interrupts. What are your configuration bits?