function EMailEstValide (emailStr)
{
  var checkTLD=1;
  var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
  var emailPat=/^(.+)@(.+)$/;
  var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
  var validChars="\[^\\s" + specialChars + "\]";
  var quotedUser="(\"[^\"]*\")";
  var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
  var atom=validChars + '+';
  var word="(" + atom + "|" + quotedUser + ")";
  var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
  var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
  var matchArray=emailStr.match(emailPat);

  if (matchArray==null)
  {
    alert("E-mail incorrect.");
    return false;
  }

  var user = matchArray[1];
  var domain = matchArray[2];

  for (i=0; i<user.length; i++)
  {
    if (user.charCodeAt(i)>127) 
    {
      alert("Invalid character in e-mail");
      return false;
    }
  }
  for (i=0; i<domain.length; i++)
  {
    if (domain.charCodeAt(i)>127)
    {
      alert("E-mail incorrect.");
      return false;
    }
  }

  if (user.match(userPat)==null)
  {
    alert("E-mail incorrect.");
    return false;
  }

  var IPArray=domain.match(ipDomainPat);
  if (IPArray!=null)
  {
    for (var i=1;i<=4;i++)
    {
      if (IPArray[i]>255)
      {
        alert("E-mail incorrect.");
        return false;
      }
    }
    return true;
  }

  var atomPat=new RegExp("^" + atom + "$");
  var domArr=domain.split(".");
  var len=domArr.length;
  for (i=0;i<len;i++)
  {
    if (domArr[i].search(atomPat)==-1)
    {
      alert("E-mail incorrect.");
      return false;
    }
  }

  if (checkTLD && (domArr[domArr.length-1].length!=2) && 
      (domArr[domArr.length-1].search(knownDomsPat)==-1) )
  {
    alert("E-mail incorrect.");
    return false;
  }

  if (len<2)
  {
    alert("E-mail incorrect.");
    return false;
  }

  return true;
}