Mine

_root.drawCirc = function(x1:Number,y1:Number,x2:Number,y2:Number,lineThickness,lineColor, choice) {
	//get radiusx
	trace(x1+","+y1+","+x2+","+y2);
	var radius:Number = (x2-x1)/2;
	var rightleft = false;
	var downup = false;
	var x:Number = null;
	var y:Number = null;
	if(radius < 0)
	{
		radius = (x1-x2)/2;
		rightleft = true;
	}
	yRadius = (y2-y1)/2;
	if(yRadius < 0)
	{
		yRadius = (y1-y2)/2;
		downup = true;
	}

	//get center
	if(!rightleft)
		x = radius + x1;
	else
		x = x2 + radius;
		
	if(!downup)
		y = y1 - yRadius;
	else
		y = yRadius + y2;
	trace("Radius: " + radius + " RadiusY: " + yRadius);
	trace("Right to left?"+rightleft + "Down up?" + downup);	
	trace("x: "+x+" y: "+y);
	// x, y = center
	// radius = radius of oval. If [optional] yRadius is defined, r is the x radius.
	// yRadius = [optional] y radius of oval.
	if (arguments.length<3) {
		return;
	}
	// init variables
	var theta, xrCtrl, yrCtrl, angle, angleMid, px, py, cx, cy;
	// if only yRadius is undefined, yRadius = radius
	if (yRadius == undefined) {
		yRadius = radius;
	}
	// covert 45 degrees to radians for our calculations
	theta = Math.PI/4;
	// calculate the distance for the control point
	xrCtrl = radius/Math.cos(theta/2);
	yrCtrl = yRadius/Math.cos(theta/2);
	// start on the right side of the circle
	angle = 0;
	this.moveTo(x+radius, y);
	// this loop draws the circle in 8 segments
	for (var i = 0; i<8; i++) {
		// increment our angles
		angle += theta;
		angleMid = angle-(theta/2);
		// calculate our control point
		cx = x+Math.cos(angleMid)*xrCtrl;
		cy = y+Math.sin(angleMid)*yrCtrl;
		// calculate our end point
		px = x+Math.cos(angle)*radius;
		py = y+Math.sin(angle)*yRadius;
		// draw the circle segment
		if(choice == 1)
		{
			_root.line_mine.lineStyle(lineThickness,lineColor,100);
			_root.line_mine.curveTo(cx, cy, px, py);
		}
		else
		{
			_root.line.lineStyle(lineThickness,lineColor,100);
			_root.line.curveTo(cx, cy, px, py);
		}
	}
};