Math.sin(Math.PI)

it's circular pre-loader. when add "secondhalf" preloader doesn't work , gives error saying script causing flash player run slowly. how can fix this?

this code in:  _root.first_mc._second_mc

 

previewimage.onloadprogress = function(targetmc, lbytes, tbytes) {

//firsthalf

//this works without "secondhalf"

          percentdone=math.round((lbytes / tbytes) * 100);

          _root.loaderpsnt_tx.percentdisplay.text = percentdone + "%";

 

//secondhalf

//this not working

      _root.mc_mask.clear();

      _root.mc_mask.beginfill(0xff0000, 100);

      _root.mc_mask.linestyle(1, 0xff0000, 80);

      (i=0; i>=c; i--) {

         x = math.sin(math.pi/90*i)*mask_ra;

         y = math.cos(math.pi/90*i)*mask_ra;

         _root.mc_mask.lineto(x, y);

       }

      _root.mc_mask.endfill();

      c = math.round(percentdone * (-1.84));

};

 

previewimage.onloadstart = function(targetmc) {

          _root.loaderpsnt_tx._visible = _root.circle._visible = _root.mc_mask._visible = true;

          _root.circle.setmask(_root.mc_mask);

          var mask_ra:number = (_root.circle._width / 1) * -1;

          var c:number = 0;

          var percentdone:number = 0;

}; 

 

previewimage.onloadcomplete = function(targetmc) {

          _root.loaderpsnt_tx._visible = _root.circle._visible = _root.mc_mask._visible = false;

};

c isn't defined when loadprogress first executes.

 

try:

 

 

previewimage.onloadprogress = function(targetmc, lbytes, tbytes) {

//firsthalf

//this works without "secondhalf"

          percentdone=math.round((lbytes / tbytes) * 100);

          _root.loaderpsnt_tx.percentdisplay.text = percentdone + "%";

 

//secondhalf

//this not working

      _root.mc_mask.clear();

      _root.mc_mask.beginfill(0xff0000, 100);

      _root.mc_mask.linestyle(1, 0xff0000, 80);

  c = math.round(percentdone * (-1.84));

      (i=0; i>=c; i--) {

         x = math.sin(math.pi/90*i)*mask_ra;

         y = math.cos(math.pi/90*i)*mask_ra;

         _root.mc_mask.lineto(x, y);

       }

      _root.mc_mask.endfill();

   

};

 

previewimage.onloadstart = function(targetmc) {

          _root.loaderpsnt_tx._visible = _root.circle._visible = _root.mc_mask._visible = true;

          _root.circle.setmask(_root.mc_mask);

          var mask_ra:number = (_root.circle._width / 1) * -1;

          var c:number = 0;

          var percentdone:number = 0;

}; 

 

previewimage.onloadcomplete = function(targetmc) {

          _root.loaderpsnt_tx._visible = _root.circle._visible = _root.mc_mask._visible = false;

};

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