actionscript 3 - Relative coordinate issue in AS3 -

i've edited following code in order let green rectangles follow cursor customized small rectangle. i've encountered several problems:

1. although haven't defined coordinate in separate class, size abviously wrong in stage when publish half size cursor coordinate.
2. the reset button cannot activated, although i've tested in other code. here work i've published: http://neowudesign.com/hwu_ex04.html

the code on timeline

//hw//creating new cursor  newcursor.startdrag ("true"); mouse.hide();   //hw//creating holder hold butterfly objects  var mothholder = new sprite(); addchild(mothholder);  //hw//creating 7 moths @ beginning  makemoths(7);  //hw//creating function can generate limited numbers of moths. function makemoths(mothsnumber:number) { (var = 0; < mothsnumber; i++) {     newmoth = new moth();     mothholder.addchild(newmoth); } }   //hw//set reset button @ top clicking, it's failed work; //hw//set cursor default one, , remove custom 1 when hovering; mothholder.setchildindex(reset,mothholder.numchildren);  reset.addeventlistener(mouseevent.mouse_over, cursorchange); function cursorchange(event:mouseevent):void {    mouse.show(); newcursor.visible = false; trace("alert!!"); }   //hw//creating function of reset  reset.addeventlistener(mouseevent.click, resetclick, false, 0, true); function resetclick(evt:mouseevent):void { removechild(mothholder); mothholder = new movieclip(); addchild(mothholder); var nummoths:number = math.round(math.random() * 6) + 1; trace("moths numeber: "+ nummoths); makebutterflies(numbutterflies); }   //hw//when cursor leave reset region, turns customized 1 reset.addeventlistener(mouseevent.mouse_out, fl_mouseouthandler); function fl_mouseouthandler(event:mouseevent):void { removeeventlistener(mouseevent.mouse_over, cursorchange); mouse.hide(); newcursor.visible = true; } 

and code class "moth" separately named "angle.as"

package { import flash.display.movieclip; import flash.events.event; import flash.geom.point;  public class angle extends movieclip {      var speed:number = 8;        function angle() {         //letting every moth follow moving of cursor         addeventlistener(event.enter_frame,mothmove);          function mothmove(myevent:event) {              trace(mousex);             trace(mousey);             var angle:number = math.atan2(mousey - y, mousex - x);             x += math.cos( angle ) * speed;             y += math.sin( angle ) * speed;         }     }    } }