@D3D:
Doesn't he want to count it down to zero again?

Code:

---

var cool_var;

function TheCount()
{
  while(cool_var < 17)
  {
    cool_var += 1;
    wait(-1);
  }

  while(cool_var > 0)
  {
    cool_var -= 1;
    wait(-1);
  }
}

---