function onlyNumbers(evt) {
	var e = evt
	if(window.event){ // IE
		var charCode = e.keyCode;
	} else if (e.which) { // Safari 4, Firefox 3.0.4
		var charCode = e.which
	}
	if (charCode > 31 && (charCode < 48 || charCode > 57))
	return false;
	return true;
}