How to parse returned XML

I am trying to parse and use the relevant information received from a server XML response. I cant seem to access the information correctly though,ive tried various means but with no luck.The basic format of response is as follows:

<getSitesUserCanAccessReturn xsi:type=”xsd:string”><?xml version=”1.0″ encoding=”UTF-8″?>
<list>
<item>
<siteId>12345</siteId>
<siteTitle>CSC1015F,2008</siteTitle>
<siteId>23344</siteId>
<siteTitle>CSC3002F,2008</siteTitle>
</item>
</list>
</ns1:getSitesUserCanAccessReturn>

Where getSitesUserCanAccessReturn is the return operation name.
Ive tried the following:
a.)
var rootNode = sites.responseXML.documentElement.getElementsByTagName( ‘getSitesUserCanAccessReturn’ );
var name = rootNode[0].getElementsByTagName(‘siteTitle’);

b.)

var sXPath = ‘getSitesUserCanAccessReturn/list’;
var col = sites.responseXML.getElementsByTagName(sXPath);
var oParticipant = col[0];
var test = oParticipant.selectNodes(“siteTitle”)[0];

Both cases didnt work and usually get an “undefined value” error message.
Cheers to anyone who can help.

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