function ChangeDataZone(tmp) {
	createXMLHttpRequest();
	xmlHttp.onreadystatechange = S_Change;
	xmlHttp.open("GET", "changezone.php?data="+document.forms['myform'].destination.value+"&defaultvalue="+tmp+"&temp="+Math.random(), true);
	xmlHttp.send(null);
}

function  S_Change(){
		if(xmlHttp.readyState == 4) {
			if(xmlHttp.status == 200) {
				document.getElementById("ComboZone").innerHTML = xmlHttp.responseText;
			}
		}
}