function URLencode(sStr) {
    return escape(sStr).
             replace(/\+/g, '%2B').
                replace(/\"/g,'%22').
                   replace(/\'/g, '%27').
                     replace(/\//g,'%2F');
  }


if (typeof(cpid)=="undefined")
{
  var cpidstring = "";
}
else
{
  var cpidstring;
  cpidstring = "&cpid=" + cpid; 
}
if (typeof(amount)=="undefined")
{
  var amountstring="";
}
else
{
  var amountstring;
  amountstring = "&amount=" + amount;
}
document.write('<img src=\"http://www.dynamicsitestats.com/mytracking/tracking.asp?do=sales' + cpidstring + amountstring + '&location=' + URLencode(location.href) + '\" width=\"1\" height=\"1\">');