How to add “Please Wait” after progress countdown?

The web video script I’m using has an Upload form that works successfully. Upon selecting “Upload” the page shows the Upload progress in % numbers up to 100%, then stays like this Upload Progress 100%" until the page redirects. I believe this is the line of code for the progress in % numbers:

PHP Code:

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request.upload.onprogress = function (event) {
callback('Upload Progress ' + Math.round(event.loaded / event.total * 100) + "%");
};
How can I display “Please Wait” after it displays “Upload Progress 100%” ? 


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Any help is appreciated.