function ChkNumFld(field1, msg) {
	// verify field has number values only (integer)
	if (field1 == undefined || field1 == 'undefined') {
		return true;
	}
	var numtochk = field1.value;
	if (numtochk == '') {
		// this function also checks null
		field1.className = 'error';
		errorMsgs += msg + '\n\r';
	}
	var numbers = /^[0-9]+$/;
	if (numtochk.match(numbers) ) {
		return true;
	}
	field1.className = 'error';
	errorMsgs += msg + '\n\r';
	return false;
}