function FormValidation()
{
	var f = document.forms[0];
	if (!validateField(f.realname, 'Please enter your name')) return false;
	if (!validateField(f.address, 'Please enter your address')) return false;
	if (!validateField(f.city, 'Please enter your city')) return false;
	if (!validateField(f.state, 'Please enter your state')) return false;
	if (!validateField(f.zip, 'Please enter your zipcode')) return false;
	if (!validateFieldLength(f.zip, 5, 'Please enter your correct zip code')) return false;
	if (!validateField(f.phone, 'Please enter your phone number')) return false;
	if (!validateFieldLength(f.phone, 10, 'Please enter your phone number with area code')) return false;
}  

function validateField(input, message){
	if (input.value == "")
	{
		alert(message);
		input.focus();
		return false;
	}
	return true;
}
function validateFieldLength(input, length, message){
	if (String(input.value).length < length)
	{
		alert(message);
		input.focus();
		return false;
	}
	return true;
}