function google_maps(){ 
	addr = document.getElementById("saddr");
	dest = document.getElementById("daddr");

	if(addr.value==""){
		alert("Please enter a zip or postal code to receive directions");
	} else {
		url = "http://maps.google.com/maps?f=d&hl=en&ie=UTF8&daddr=" + dest.value + "&saddr=" + addr.value;
		window.open(url, "google_maps");		
	}
}