jumpy progress bar during upload

import flash.net.FileReferenceList;
import flash.net.FileReference;

var listener:Object = new Object();


fileList._x = browseButton._x + 20;
fileList._y = browseButton._y + 30;

progress._visible = false;
uploadButton._alpha = 25;

_global.yCounter = browseButton._y;

// dont let uploadButton work at start...only enable once browse has been called
uploadButton.enabled = false;

// holds the list of files
_global.files = new Array();



listener.onSelect = function(fileRefList:FileReferenceList) {
    
    uploadButton.enabled = true;
    uploadButton._alpha = 100;
    
    // clear all the old checks if we had just done an upload
    for(i=0; i < _global.howManyChecksToClear; i++) {
        removeMovieClip("done_"+i);
    }
    
    // fileRefList.fileList == what was just selected in the browse window
    // concatenate that to our existing list of files
    // because array files should hold all the files
    var list:Array = fileRefList.fileList;
    _global.files = _global.files.concat(list);
    
    // a file reference holds information about a file from the fileList (ex name, size?)
    
    
    
    // clear the file list text box so we can reprint everything
    fileList.text = "";
    
    // go through the files
    for (i = 0; i<_global.files.length; i++) {
        
        var item:FileReference;

        // put file in item
        item = _global.files[i];
        
        // have to call this AFITER item has file - otherwise the first one will be undefined
        trace(item.addListener(this));
        
        // print the name of that file
        fileList.text += item.name+"\n"; // print files on screen
        
        // create a new delete button
        var newDeleteButton = _root.attachMovie("deleteButton", "box_"+i, i);
        newDeleteButton.id = i;
        newDeleteButton._y =fileList._y + (i*17); // this started at the y pos of the browse button (to line things up)
        newDeleteButton._x = fileList._x - 13; // static
        
        // DELETE FILE
        // 1. clear the file display list
        // 2. remove item from array
        // 3. reprint list of files
        // 4. get rid of its "x" delete button
        newDeleteButton.onRelease = function() {
            // clear our display list of files
            fileList.text = "";

            // take out this file from our array of files
            _global.files.splice(this.id,1);
            
            // reprint our list of files
            for (var i = 0; i<_global.files.length; i++) {
                item = _global.files[i];
                fileList.text += item.name+"\n";
                
            }
            // get rid of the x
            removeMovieClip("box_"+i);
            
            
            
        };
        
        
        
            
    }
};

//listener.onProgress = function(file:FileReference, bytesLoaded:Number, bytesTotal:Number):Void {
//  trace("onProgress with bytesLoaded: " + bytesLoaded + " bytesTotal: " + bytesTotal);
//}



listener.onProgress = function(file:FileReference, bytesLoaded:Number, bytesTotal:Number):Void {
    // only show the progress bar if files are big enough to reach onProgress function
    progress._visible = true;
    progress.mode = "manual";
    progress.setProgress(bytesLoaded, bytesTotal);
    trace("bytesLoaded: " + bytesLoaded + " bytesTotal: " + bytesTotal);
    
    
    if(bytesLoaded < (bytesTotal*.25) && bytesLoaded > (bytesTotal*.10)) {
        uploadStatus.text = "Pretty snazzy image you're uploading there.";
        
    }
    
    if(bytesLoaded < (bytesTotal*.50) && bytesLoaded >= (bytesTotal*.25)) {
        uploadStatus.text = "This will totally be worth the wait.";
        
    }
    
    
    if(bytesLoaded < (bytesTotal*.75) && bytesLoaded >= (bytesTotal*.50)) {
        uploadStatus.text = "Almost there...!";
        
    }
    
    
    
    if(bytesLoaded == bytesTotal) {
        uploadStatus.text = "Just about done! Give us a couple more seconds to wrap things up";
        progress.setProgress(99, 100);
    }
    
}


listener.onComplete = function(file:FileReference):Void {
    
    
    /// check marks
    
    i = _global.fileCount;
    _global.fileCount ++;
    var newDoneIcon = _root.attachMovie("doneIcon", "done_"+i, i);
    newDoneIcon.id = i;
    newDoneIcon._y = fileList._y + (i*17); // this started at the y pos of the browse button (to line things up)
    newDoneIcon._x = fileList._x - 13; // static
    
    trace("onComplete: "+file.name);    
    
    
    // WHEN ALL FILES ARE DONE
    if(i == (_global.files.length - 1)) {
        trace("ALL FILES HAVE BEEN UPLOADED");
        
        var sendVars:LoadVars = new LoadVars();
        for (var i:Number = 0; i<_global.files.length; i++) {
            var item:FileReference;
            item = _global.files[i];
            
            // weird workaround for first file being undefined...
            // have to use == instead of += for first one
            if(i==0) {
                sendVars.files = item.name + ":";
            }
            else {
                sendVars.files += item.name;
                sendVars.files += ":";
            }
            
            
        }
        
        sendVars.howManyFiles = _global.files.length;
        
        
        sendVars.send("http://photojojo.com/imageEditor/vinyls/showAll.php", "_self", "POST");
        
    
    
        // now clear the list since we're all done uploading.
        _global.files.splice(0);
    }
    
    
};







listener.onHTTPError = function(file:FileReference, httpError:Number):Void {
  trace("HTTP Error :" + httpError);
  // Write code here to do corrective actions
}


listener.onIOError = function(file:FileReference):Void {
  trace("An IO Error occured");
}

listener.onSecurityError = function(file:FileReference, errorString:String):Void {
  trace("SecurityError: " + file.name + " ErrorString: " + errorString);
}





var fileRef:FileReferenceList = new FileReferenceList();
fileRef.addListener(listener);

browseButton.onRelease = function() {
    upload.enabled = true;
    fileRef.browse([{description:"Image files", extension:"*.jpg;*.gif;*.png"}]);
};

uploadButton.onRelease = function() {
    
    // go through the array of files uploading each one
    this.enabled = false;
    
    
    
    // clear fileCount - used in onComplete for putting checks
    _global.fileCount = 0;
    
    for (var i:Number = 0; i<_global.files.length; i++) {
        item = _global.files[i];
        trace("uploadButtonRelease: " + item.name);
        item.upload("upload.php");
        
        // get rid of delete x icons
        removeMovieClip("box_"+i);
        
        
        
    }
    
    // before we clear the file list, get how long it is - this is how many checks we'll have to delete next time they click "browse"
    _global.howManyChecksToClear = _global.files.length;
    
    
    // before we delete file list, make a copy of it for other functions
    
    
    // moved this to onProgress
    // now clear the list since we're all done uploading.
    //_global.files.splice(0);
    
    
};