XMLHttpRequest not working?

[btate]

Hello -

I'm new to AJAX and am experiencing a problem with my XMLHttp Request. This is the error I keep receiving:

Error: xmlDoc is undefined
Source File: videoSearch.js Line 7

Here is the code for the source file:

function searchVideos() {

var xmlDoc=loadXMLDoc();

var x=xmlDoc.getElementsByTagName("videoIndex")[0];
var y=x.childNodes[0];
document.write(y.nodeValue);

}

function loadXMLDoc() {
var Request = false;
if (window.XMLHttpRequest) {
// Try FireFox, Safari, Opera, IE 7 or higher
Request = new XMLHttpRequest();
}
else if (window.ActiveXObject) {
// Try ActiveX (IE 5 or 6)
Request = new ActiveXObject("Microsoft.XMLHTTP");
}

if (Request) {
Request.open("GET", "videoLibrary.xml");
Request.onreadystatechange = function() {
if (Request.readyState == 4 && Request.status == 200) {

var xmlDoc = Request.responseXML;
return(xmlDoc);

}
}
Request.send(null);
}
}

-------------------------- End Code ---------------------

I'm calling the searchVideos() function with <a href="javascript:function()"> in an HTML page. If the code was working properly, it should return a value of 1. Can anyone help me?

--

Thanks,
btate