function ajaxCall(async, methodType, url, data, successCallback, errorCallback) {
    $.ajax({
        async: async,
        type: methodType,
        contentType: "application/json; charset=utf-8",
        url: url,
        data: data,
        dataType: "json",
        error: errorCallback,
        success: successCallback
    });
}

function ajaxXmlCall(async, methodType, url, data, successCallback, errorCallback) {
    $.ajax({
        async: async,
        type: methodType,
        contentType: "text/xml; charset=utf-8",
        url: url,
        data: data,
        dataType: "xml",
        error: errorCallback,
        success: successCallback
    });
}