var car_car = 0;

if(car_car == 1)
{

if(key_z==off)
{
//you code, when you click z
}
if(key_a==off)
{
//you code, when you click a
}
if(key_d==off)
{
//you code, when you click d
}
if(key_s==off)
{
//you code, when you click s
}
THE CODE NOT WORK