function addPreviewParam()
{
    var pTagArray = document.getElementsByTagName("a");
    
    for(var i = 0; i < pTagArray.length; i++)
    {
        if (pTagArray[i].href.indexOf(".aspx") > 0 && pTagArray[i].href.indexOf("preview=true") < 0 && pTagArray[i].href.indexOf("ChangeLang.aspx") < 0)
        {
            if (pTagArray[i].href.indexOf(".aspx") + 5 == pTagArray[i].href.length)
            {
                pTagArray[i].href = pTagArray[i].href + "?preview=true";
            }
            else
            {
                pTagArray[i].href = pTagArray[i].href + "&preview=true";
            }
        }
    }
}