load email template when an email activity is addded in contact

Hello All,

I'm using below code to load email template on, onload of email activity. But its giving me error as CreateXmlDocument is undefined.

function loadtemplate()
{
var emailTemplateToLoad = "E83BA87D-65B9-E211-A110-00155D019F1E";//guid of template
// Get Regarding object details
var RegardingItems =Xrm.Page.getAttribute("regardingobjectid").getValue();
var regardingObjectId = RegardingItems[0].id;
var regardingObjectType = RegardingItems[0].type;
var command = new RemoteCommand("EmailTemplateService", "GetInstantiatedEmailTemplate");
command.SetParameter("templateId", emailTemplateToLoad );
command.SetParameter("objectId", regardingObjectId);
command.SetParameter("objectTypeCode", regardingObjectType);
var result = command.Execute();
if (result.Success)
{
    var o = new Object();
    o.EmailBody = "";
    o.EmailSubject = "";
    if(typeof(result.ReturnValue) == "string")
    {
        oXml = CreateXmlDocument(false);
        oXml.loadXML(result.ReturnValue);
        crmForm.all.description.InsertValue(oXml.selectSingleNode("template/body").text);
        o.EmailSubject = oXml.selectSingleNode("template/subject").text;
    }
}

}

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