function getQuerystring(key, default_)
{
  if (default_==null) default_="";
  key = key.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
  var regex = new RegExp("[\\?&]"+key+"=([^&#]*)");
  var qs = regex.exec(window.location.href);
  if(qs == null)
      return default_;
  else
      return qs[1];
}


var a = getQuerystring("a", ""); 
var b = getQuerystring("b", "");
var c = getQuerystring("c", "");

location.href="http://www.tracklead.net/click.track?CID=25828&AFID=75040&ADID=214431&SID="+ a + "-" + b + "-" + c;