function onSubmit(form) {
	if ((form.zip.value == 'Enter Zip Code') || (form.zip.value == '')) {
		alert("Please enter a valid Zip Code.");
		form.zip.focus();
		form.zip.select();
		return false;
	}
	// zip should be a number and 5 digits
	if ((isNaN(form.zip.value)) || form.zip.value.length < 5) {
		alert("Please enter a valid Zip Code.");
		form.zip.focus();
		form.zip.select();
		return false;
	}
	form.lookupText.value=form.zip.value;
	resetZip(form);
}
function resetZip(form) {
	form.zip.value="Enter Zip Code";
	form.zip.style.color="#999";
	form.zip.style.marginTop="6px";
	form.zip.style.marginBottom = "4px";
	form.zip.style.border="#ccc 1px solid";
}