checkers!!

hello!

I am working on my project and making checkers game.Uptill now i have just uploaded checkers board image and interface mouse.The problem is that how could i select a particular position(x,y coordinates) through mouse.I need just a little help and i will go for it.Here is my code.

Code:

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#include <allegro.h>
int x = 50;
int y = 680;

void init();
void deinit();

BITMAP* buffer;
int cursor_x = 20;
int cursor_y = 20;

int getMouseInfo(){
    if((mouse_b & 2) &&(mouse_b & 1) && (mouse_b & 3))
    {
                  cursor_x = mouse_x;
                  cursor_y = mouse_y;
      return 1;
    }
  return 0;
}
void updateScreen(){
 
    show_mouse(screen);
    circlefill ( buffer, cursor_x, cursor_y, 5, makecol( 0, 0, 0));
    draw_sprite( screen, buffer, 0, 0); 
}






int main() {
        init();

        while (!key[KEY_ESC]) {
                getMouseInfo();
          updateScreen();

   
            clear_keybuf();
       
        acquire_screen();
       
        textout_ex( screen, font, " ", x, y, makecol( 0, 0, 0), makecol( 0, 0, 0) );
       
     
        textout_ex( screen, font, "Your time", x, y, makecol( 255, 0, 0), makecol( 0, 0, 0) );
       
        release_screen();
       
        rest(50);

        }




        deinit();
        return 0;
}
END_OF_MAIN()

void init() {
        int depth, res;
        allegro_init();
        depth = desktop_color_depth();
        if (depth == 0) depth = 32;
        set_color_depth(depth);
        res = set_gfx_mode(GFX_AUTODETECT, 1024, 768, 0, 0);
        if (res != 0) {
                allegro_message(allegro_error);
                exit(-1);
        }

        install_timer();
        install_keyboard();
        install_mouse();

    BITMAP *my_pic = NULL; //Declare a BITMAP called my_pic, setting it to NULL
   
    my_pic = load_bitmap("checkers.bmp", NULL); // Load our picture

    blit(my_pic, screen, 0,0,180,120,2000,2000);//Draw the whole bitmap to the screen at (

    buffer = create_bitmap( 1024, 768);
   
   

        show_mouse(screen); 
   
   
    while( !key[KEY_ESC])
 {
  int switcher=1;
  while(getMouseInfo())
  {
  updateScreen();
  if(getMouseInfo()==0) switcher=0;
  }
  if(switcher==0) show_mouse(screen);
    }
   
 
   
}

void deinit() {
        clear_keybuf();
        /* add other deinitializations here */
}

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