var C = new Canvas();
var C2 = new Canvas();

function circles(cx,cy) {
//radius and center point variables
var rx = .01, ry = .45;
var ry2 = .01, rx2 = .35;

//increment variable

var yinc = .055;
var xinc = .05;

var pen = .01;

//black circles
while ( rx <= .4) {

C.setPenColor(0,0,0);
C.setPenWeight(pen);
C.drawOval(false, cx, cy, rx, ry );
rx += xinc*2;

}
//red circles
while ( ry2<.5) {

C.setPenColor(1,0,0);
C.setPenWeight(pen);
C.drawOval(false, cx, cy, rx2, ry2 );
ry2 += yinc*2
pen += .0025;

}
}

//code to place circles on stage by user input
on (press) {
circles(cx,cy);
}