[2D] Making my character face the mouse?

[Overx]

Since 4.3 came out I decided I would make a simple top down game, but when I try to make the character rotate to face the mouse it just flips out. Could someone give me a quick rundown on how to do this with a 2D sprite?

[CanCo]

I do this:

var pos : Vector3;
	pos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
	pos.z = 0;
	
	var angle = Vector3.Angle(pos-transform.position,Vector3.down);
	
	if(pos.x > transform.position.x)
		angle*=-1;
	
	transform.rotation = Quaternion.Slerp(transform.rotation,Quaternion.Euler(0,0,180-angle),rotateSpeed*Time.deltaTime);

–Fixed the code.