var expires = 999;
var today = new Date();
var expr = new Date(today.getTime() + (expires * 86400000));
var affidstr = window.location.search.substring(1,6);

if (affidstr == "affid") {
   var idnum = window.location.search.substring(7);
   if (idnum) {
      var name = 'affiliate';
      var value = idnum;
      var path = '/';
      document.cookie = name + "=" +escape(value) +
      ( (expires) ? ";expires=" + expr.toGMTString() : "") +
      ( (path) ? ";path=" + path : "");
   }
}
<!--

function changeDiv(the_div,the_change) {
  var the_style = getStyleObject(the_div);
  if (the_style != false)  {
    the_style.display = the_change;
  }
}

function hideAll() {
  changeDiv("mes","none");
}


function getStyleObject(objectId) {
  if (document.getElementById && document.getElementById(objectId)) {
    return document.getElementById(objectId).style;
  } else if (document.all && document.all(objectId)) {
    return document.all(objectId).style;
  } else {
    return false;
  }
}
// -->