function getClientWidth()
{
    return filterResults(
    window.innerWidth ? window.innerWidth : 0,
    document.documentElement ? document.documentElement.clientWidth : 0,
    document.body ? document.body.clientWidth : 0);
}

function getClientHeight()
{
    return filterResults (
    window.innerHeight ? window.innerHeight : 0,
    document.documentElement ? document.documentElement.clientHeight : 0,
    document.body ? document.body.clientHeight : 0);
}

function filterResults(n_win, n_docel, n_body)
{
    var n_result = n_win ? n_win : 0;
    if (n_docel && (!n_result || (n_result > n_docel)))
    n_result = n_docel;
    return n_body && (!n_result || (n_result > n_body)) ? n_body : n_result;
}

function openWindow(url)
{
    params = "width=" + getClientWidth() + ",height=" + getClientHeight() + "," +
        "scrollbars=yes,location=yes,menubar=yes,resizable=yes,status=yes,toolbar=yes";
    
    newWindow = window.open(url, "", params);
    newWindow.focus();
  
    // return false to avoid opening the window through normal HTML
    return false;
}