How to add progress bar?

Hi All,

I need a help on adding progress bar to my script.

Here is my script.

var mydoc = app.activeDocument;

mydoc.zeroPoint = [0,0];

var win = new Window("dialog", undefined, [0,0,465,72], );

var graphicsfilepath;

with(win){

          win.panel = add( "panel", [5,5,460,67], undefined );

          with(win.panel){

                    win.panel.sText = add( "statictext", [5,5,70,25], 'Imagepath: ' );

                    win.panel.eText1 = add( "edittext", [70,3,370,23], graphicsfilepath );

                    win.panel.but = add( "button", [375,3,445,25], 'Choose' );

         win.panel.but .onClick = function (){

         var graphicsfilepath = Folder.selectDialog ("Please select the graphics folder");

                win.panel.eText1.text = graphicsfilepath;

         }

                    win.panel.but = add( "button", [300,30,370,52], 'Ok' );

                    win.panel.but = add( "button", [375,30,445,52], 'Cancel' );

                    }

          }

win.center();

win.show();

placeart();

var myfolder, myfiles, mypage, myrect;

delfirstpage()

function placeart(){

        myfolder = new Folder(win.panel.eText1.text);

        myfiles = myfolder.getFiles(myFilter);

        for (var i =0;i<myfiles.length;i++){

                if (myfiles!=0){

                        mypage = mydoc.pages.add();

                    }

                else{

                        mypage = mydoc.pages.item(0);

                    }

              var act_width=mydoc.documentPreferences.pageWidth;

              //alert(topmargin)

              var topmargin = mydoc.masterSpreads.item(0).pages.item(0).marginPreferences.top;

              var leftmargin = mydoc.masterSpreads.item(0).pages.item(0).marginPreferences.left;

              //alert(leftmargin)

              mydoc.viewPreferences.horizontalMeasurementUnits = MeasurementUnits.millimeters;

              mydoc.viewPreferences.verticalMeasurementUnits = MeasurementUnits.millimeters;

              mydoc.viewPreferences.rulerOrigin = RulerOrigin.pageOrigin;

              var bottommargin = mydoc.masterSpreads.item(0).pages.item(0).marginPreferences.bottom;

                               var act_height=mydoc.documentPreferences.pageHeight;

                var heigthwithoutmargin = act_height - (topmargin + bottommargin);

                myrect = mypage.rectangles.add();

                var gb = myrect.geometricBounds;

                myrect.geometricBounds = [gb[0] + topmargin, gb[1] +leftmargin, gb[2] +topmargin, gb[3]+leftmargin];

                var myfile = File(myfiles);

                myrect.place(myfile);

                myrect.fit(FitOptions.FRAME_TO_CONTENT)

            }

    }

function delfirstpage(){

        mydoc.pages.everyItem().appliedMaster = mydoc.masterSpreads.item("A-Master")

        var mypage = mydoc.pages.item(0);

        mypage.remove();

        mydoc.pages.item(0).appliedMaster = mydoc.masterSpreads.item("B-Master")

    }

function myFilter(myFile)

{

          if(myFile.name.indexOf(".tif")>-1)

          return true;

          if(myFile.name.indexOf(".tiff")>-1)

          return true;   

          else if(myFile.name.indexOf(".eps")>-1)

          return true;

          if(myFile.name.indexOf(".gif")>-1)

          return true;

          if(myFile.name.indexOf(".jpg")>-1)

          return true;

          if(myFile.name.indexOf(".jpeg")>-1)

          return true;

    if(myFile.name.indexOf(".TIF")>-1)

          return true;

    if(myFile.name.indexOf(".TIFF")>-1)

          return true;

          else if(myFile.name.indexOf(".EPS")>-1)

          return true;

          if(myFile.name.indexOf(".GIF")>-1)

          return true;

          if(myFile.name.indexOf(".JPG")>-1)

          return true;

          if(myFile.name.indexOf(".JPEG")>-1)

          return true;

          else

          return false;

}