function getParameter(param)
{
    var query = window.location.search;
    var iLen = param.length;
    var iStart = query.indexOf(param);
    if (iStart == -1)
      return "";
    iStart += iLen + 1;
    var iEnd = query.indexOf("&", iStart);
    if (iEnd == -1)
      return unescape(query.substring(iStart));

    return unescape(query.substring(iStart, iEnd));
}