function validateBuyForm() {
	var isValid = true;

	//Check and validate user input
	if (document.forms['buyForm'].elements['setZip'].value.length != 5 || isNaN(document.forms['buyForm'].elements['setZip'].value)) {
		alert('Please enter a valid zip code.');
		document.forms['buyForm'].elements['setZip'].focus();
		isValid = false;

	} 
	
	return isValid;
}