function loadjscssfile(filename, filetype){
if (filetype=="js"){ //if filename is a external JavaScript file
  var fileref=document.createElement('script');
  fileref.setAttribute("type","text/javascript");
  fileref.setAttribute("src", filename);
}
else if (filetype=="css"){ //if filename is an external CSS file
  var fileref=document.createElement("link");
  fileref.setAttribute("rel", "stylesheet");
  fileref.setAttribute("type", "text/css");
  fileref.setAttribute("href", filename);
}
if (typeof fileref!="undefined")
  document.getElementsByTagName("head")[0].appendChild(fileref);
}
if (window.location.href.indexOf('source=email') != -1)
{
                loadjscssfile("http://ads.bttbgroup.com/px?id=6182&seg=78998&t=1", "js");
}
else
{
                if (document.referrer.indexOf('facebook.com') != -1)
                {
                                loadjscssfile("http://ads.bttbgroup.com/px?id=7620&seg=81872&t=1","js");
                }
                else
                                loadjscssfile("http://ads.bttbgroup.com/px?id=3058&seg=57912&t=1", "js");
}