function ajaxIslem(mail)
{
var reg = /^([a-zA-Z0-9_.-])+@([a-zA-Z0-9_.-])+\.([a-zA-Z])+([a-zA-Z])+/;
if (!mail.match(reg))
  {
  document.getElementById("ben").innerHTML=" Hatalı Giriş! Lütfen e-maili kontrol ediniz.";
document.getElementById("bulten").className="pasif";
  return;
  }else{
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("ben").innerHTML=xmlhttp.responseText;
document.getElementById("bulten").className="aktif";
    }
  }
}
xmlhttp.open("GET","ajx2.php?mail="+mail,true);
xmlhttp.send();
}