function validateEmail()
{
var x=document.forms["newsl"]["email_nl"].value;
var atpos=x.indexOf("@");
var dotpos=x.lastIndexOf(".");
if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length)
  {
  alert("Bitte g\u00fcltige Email-Adresse angeben!");
  return false;
  }
}