function showPopup(whitepaper, lang) {

    var location = "http://whitepapers.genetec.com/Whitepaper.aspx?whitepaper=" + whitepaper + "&lang=" + lang;
    document.getElementById("modal").src = location;
    document.getElementById('modal').style.visibility = 'visible';
    document.getElementById('modalbg').style.display = 'block';
}