Get Logged in User Teams and Get Team details by TeamId

function getUserTeams() {
    var userId = Xrm.Page.context.getUserId().substr(1, 36);
    var serverUrl = "/" + Xrm.Page.context.getOrgUniqueName();
    var oDataEndpointUrl = serverUrl + "/XRMServices/2011/OrganizationData.svc/";
    oDataEndpointUrl += "TeamMembershipSet?$filter=SystemUserId eq guid' " + userId + " '";
    var service = GetRequestObject();
    if (service != null) {
        service.open("GET", oDataEndpointUrl, false);
        service.setRequestHeader("X-Requested-Width", "XMLHttpRequest");
        service.setRequestHeader("Accept", "application/json,text/javascript, */*");
        service.send(null);
        var requestResults = eval('(' + service.responseText + ')').d;
        if (requestResults != null && requestResults.results.length > 0) {
            return requestResults.results;
        }
    }
}

function getUserTeamName(teamid) {
    var serverUrl = "/" + Xrm.Page.context.getOrgUniqueName();
    var oDataEndpointUrl = serverUrl + "/XRMServices/2011/OrganizationData.svc/";
    oDataEndpointUrl += "TeamSet?$select=Name,TeamId&$filter=TeamId eq guid'" + teamid + "'";
    var service = GetRequestObject();
    if (service != null) {
        service.open("GET", oDataEndpointUrl, false);
        service.setRequestHeader("X-Requested-Width", "XMLHttpRequest");
        service.setRequestHeader("Accept", "application/json,text/javascript, */*");
        service.send(null);
        var requestResults = eval('(' + service.responseText + ')').d;
        if (requestResults != null && requestResults.results.length > 0) {
            return requestResults.results;
        }
    }
}

function GetRequestObject() {
    if (window.XMLHttpRequest) {
        return new window.XMLHttpRequest;
    } else {
        try {
            return new ActiveXObject("MSXML2.XMLHTTP.3.0");
        } catch (ex) {
            return null;
        }
    }
}