Retreive lookup fields with OData

Hi,

I have a lookup field named "new_smstemplateid" related to the the entity "new_smstemplate", i need to retrieve another field 'new_messagetemplate" but the code below don't return any data :

function GetRelated()
{
   var contact = new Array();
    contact = Xrm.Page.getAttribute("new_smstemplateid").getValue();

    if (contact == null) {
        return;
    }

    var serverUrl = Xrm.Page.context.getClientUrl();
    var oDataSelect = serverUrl + "/XRMServices/2011/OrganizationData.svc/new_smstemplateSet?$select=new_messagetemplate&$filter=new_smstemplateid eq guid'" + contact[0].id + "'";
alert(oDataSelect);
    var retrieveReq = new XMLHttpRequest();
    retrieveReq.open("GET", oDataSelect, false);
    retrieveReq.setRequestHeader("Accept", "application/json");
    retrieveReq.setRequestHeader("Content-Type", "application/json;charset=utf-8");
    retrieveReq.onreadystatechange = function () {
        GetContactData(this);
    };
    retrieveReq.send();
}

function GetContactData(retrieveReq) {
    if (retrieveReq.readyState == 4) {
        if (retrieveReq.status == 200) {
            var retrieved = JSON.parse(retrieveReq.responseText).d;
            Xrm.Page.getAttribute("new_message").setValue(retrieved.results[0].new_messagetemplate);
        }
    }
}