and if you insist on using ur own trigonometry you need to write an atan2 function which'll return between +-180 (unless you have the latest A7 private-beta).

it just so happens i have one in my back-pocket (changed to work with c-script but untested):
Code:

---

function atan2(var x,var y)
{
	if(y==0)
	{
		return (90*sign(x));
	}
	return(atan(x/y) - (180 * (y<0)));
}

---

julz