function numbersonly(e) {
	var key;
	var keychar;

	if (window.event) key = window.event.keyCode;
	else if (e) key = e.which;
	else return true;

	keychar = String.fromCharCode(key);

	// control keys
	if ((key==null) || (key==0) || (key==8) || (key==9) || (key==13) || (key==27) ) return true;

	// numbers
	if ((("0123456789").indexOf(keychar) > -1)) return true;

  return false;
}