MovieClip.prototype.traceRectangle=function(xPos,yPos,width,height,fillColor,lineColor,alpha){

  this.beginFill(fillColor,alpha); /* debut du remplissage */
  this.lineStyle(1,lineColor,alpha); /* début du contour */
  this.moveTo(xPos,yPos);
  this.lineTo(xPos+width,yPos);
  this.lineTo(xPos+width,yPos+height);
  this.lineTo(xPos,yPos+height);
  this.lineTo(xPos,yPos); /* fin du contour */
  this.endFill(); /* fin du remplissage */

}

var clip1 = createEmptyMovieClip("clip_1", 1);
var clip2 = createEmptyMovieClip("clip_2", 2);

clip_1.traceRectangle(10,10,200,200,0xff9933,0xff0000,100);
clip_2.traceRectangle(20,20,100,100,0x00aa00,0xff0000,100);