Ping Pong code error

Hi All,
I`m new to C++ .Trying to run a code, that I downloaded off of web . Getting error below. Please help. Thanks .
Neel .

Error 1 error C1083: Cannot open include file: 'allegro.h': No such file or directory c:\users\nisha\documents\visual studio 2010\projects\game\game\pong.cpp 1

3 IntelliSense: identifier "BITMAP" is undefined c:\users\nisha\documents\visual studio 2010\projects\game\game\pong.cpp 30

Code below :
#include <allegro.h>
#include <cstdlib>
#include <time.h>


int ball_x = 320;
int ball_y = 240;

int ball_tempX = 320;
int ball_tempY = 240;

int p1_x = 20;
int p1_y = 210;

int p1_tempX = 20;
int p1_tempY = 210;

int p2_x = 620;
int p2_y = 210;

int p2_tempX = 620;
int p2_tempY = 210;

time_t secs; //The seconds on the system clock will be stored here
//this will be used as the seed for srand()

int dir; //This will keep track of the circles direction
//1= up and left, 2 = down and left, 3 = up and right, 4 = down and right

BITMAP *buffer; //This will be our temporary bitmap for double buffering

void moveBall(){

ball_tempX = ball_x;
ball_tempY = ball_y;

if (dir == 1 && ball_x > 5 && ball_y > 5){

if( ball_x == p1_x + 15 && ball_y >= p1_y && ball_y <= p1_y + 60){
dir = rand()% 2 + 3;
}else{
--ball_x;
--ball_y;
}

} else if (dir == 2 && ball_x > 5 && ball_y < 475){

if( ball_x == p1_x + 15 && ball_y >= p1_y && ball_y <= p1_y + 60){
dir = rand()% 2 + 3;
}else{
--ball_x;
++ball_y;
}

} else if (dir == 3 && ball_x < 635 && ball_y > 5){

if( ball_x + 5 == p2_x && ball_y >= p2_y && ball_y <= p2_y + 60){
dir = rand()% 2 + 1;
}else{
++ball_x;
--ball_y;
}

} else if (dir == 4 && ball_x < 635 && ball_y < 475){

if( ball_x + 5 == p2_x && ball_y >= p2_y && ball_y <= p2_y + 60){
dir = rand()% 2 + 1;
}else{
++ball_x;
++ball_y;
}

} else {

if (dir == 1 || dir == 3) ++dir;
else if (dir == 2 || dir == 4) --dir;

}

acquire_screen();
circlefill ( buffer, ball_tempX, ball_tempY, 5, makecol( 0, 0, 0));
circlefill ( buffer, ball_x, ball_y, 5, makecol( 128, 255, 0));
draw_sprite( screen, buffer, 0, 0);
release_screen();

rest(5);

}

void p1Move(){

p1_tempY = p1_y;

if( key[KEY_W] && p1_y > 0){

--p1_y;

} else if( key[KEY_S] && p1_y < 420){

++p1_y;

}

acquire_screen();
rectfill( buffer, p1_tempX, p1_tempY, p1_tempX + 10, p1_tempY + 60, makecol ( 0, 0, 0));
rectfill( buffer, p1_x, p1_y, p1_x + 10, p1_y + 60, makecol ( 0, 0, 255));
release_screen();

}

void p2Move(){

p2_tempY = p2_y;

if( key[KEY_UP] && p2_y > 0){

--p2_y;

} else if( key[KEY_DOWN] && p2_y < 420){

++p2_y;

}

acquire_screen();
rectfill( buffer, p2_tempX, p2_tempY, p2_tempX + 10, p2_tempY + 60, makecol ( 0, 0, 0));
rectfill( buffer, p2_x, p2_y, p2_x + 10, p2_y + 60, makecol ( 0, 0, 255));
release_screen();

}

void startNew(){

clear_keybuf();
readkey();
clear_to_color( buffer, makecol( 0, 0, 0));
ball_x = 320;
ball_y = 240;

p1_x = 20;
p1_y = 210;

p2_x = 620;
p2_y = 210;

}

void checkWin(){

if ( ball_x < p1_x){
textout_ex( screen, font, "Player 2 Wins!", 320, 240, makecol( 255, 0, 0), makecol( 0, 0, 0));
startNew();
} else if ( ball_x > p2_x){
textout_ex( screen, font, "Player 1 Wins!", 320, 240, makecol( 255, 0, 0), makecol( 0, 0, 0));
startNew();
}

}

void setupGame(){

acquire_screen();
rectfill( buffer, p1_x, p1_y, p1_x + 10, p1_y + 60, makecol ( 0, 0, 255));
rectfill( buffer, p2_x, p2_y, p2_x + 10, p2_y + 60, makecol ( 0, 0, 255));
circlefill ( buffer, ball_x, ball_y, 5, makecol( 128, 255, 0));
draw_sprite( screen, buffer, 0, 0);
release_screen();

time(&secs);
srand( (unsigned int)secs);
dir = rand() % 4 + 1;

}

int main(){

allegro_init();
install_keyboard();
set_color_depth(16);
set_gfx_mode( GFX_AUTODETECT, 640, 480, 0, 0);

buffer = create_bitmap( 640, 480);

setupGame();

while( !key[KEY_ESC]){

p1Move();
p2Move();
moveBall();
checkWin();

}

return 0;

}
//END_OF_MAIN();
You have to install allegro library: http://alleg.sourceforge.net/
You should also use code tags:
http://www.cplusplus.com/articles/jEywvCM9/
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