the example abobe is not what I am looking for. What I would like to tdo I  allow the user to upload one file only. so the user chooses browser pick the file , before manually uploading the user might want to upload a different file, so he should be able to click on browse again and select another file, but here is where i get a javascript alert saying maximum number of files to be uploaded is 1, I do not want this alert and what i would like to achieve f browse was clicked on again to reset the uploader and add the new file info.

thanks