求asp运用ajax填充下拉菜单的问题

JScript code:
<script language="javascript" type="text/javascript">
var xmlHttp = false;
try {
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e2) {
xmlHttp = false;
}
}
if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
xmlHttp = new XMLHttpRequest();
}

function callServer() {
var id = document.getElementById("Hotel").value;
if ((id == null) || (id =="")) return;
var url = "getRoom.asp?id=" + escape(id);

xmlHttp.open("GET", url, true);
xmlHttp.onreadystatechange = updatePage;
xmlHttp.send(null);

}

function updatePage() {
if (xmlHttp.readyState < 4) {

}
if (xmlHttp.readyState == 4) {
if(xmlhttp.status==200)
{
var response = xmlHttp.responseText;
}
}
}
</script>

VBScript code:

<select name="Hotel" id="Hotel" onchange="callServer()"></select>
<select name="Room">怎么填充着个下拉菜单</select>

---

var response = xmlHttp.responseText
改为
document.getElementById("Room&