function check_file() {
	var file = document.upload.newsletter.value;
	var str = file.substring( file.length - 4, file.length );

	if( str == '.pdf' || str == '.PDF' ) {
		return 1;
	} else {
	  alert( 'You must upload a PDF file' );
	  return 0;
	}

	return 0;
}

function return_void() {
}