function validateForm() {
	// check for field entry
	if (document.getElementById('zip-code-search').value == '') {
		alert("Zip code dude.");
		return false;
	}
	// check for all number
	if (isNaN(document.getElementById('zip-code-search').value)) {
		alert("Zip codes are made of all numbers Hombre.");
		return false;
	}
	// check for minimum length
	var minZipLength = 5;
	if (document.getElementById('zip-code-search').value.length < minZipLength) {
		alert("All five digits please.");
		return false;
	}
	return true;
}

function clearText(thefield){
	if (thefield.defaultValue==thefield.value)
	thefield.value = ""
}