for(i=0; i<1; i++) {
    lcd_disp1(lcd_door,0);
    temp=keypad();
    if(temp != ERROR_VAL)  break;

    lcd_disp1(lcd_change,0);
    temp=keypad();
    if(temp != ERROR_VAL)  break;

    lcd_disp1(lcd_exit,0);
    temp=keypad();
    if(temp != ERROR_VAL)  break;
}