function emailCheck1 (emailStr) {
    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("Email address seems incorrect (check @ and .'s)");
      return false;
    }
    var user=matchArray[1];
    var domain=matchArray[2];
    if (user.match(userPat)==null) {
        alert("The username doesn't seem to be valid.");
        return false;
    }
    var IPArray=domain.match(ipDomainPat);
    if (IPArray!=null) {
        for (var i=1;i<=4;i++) {
          if (IPArray[i]>255) {
              alert("Destination IP address is invalid!");
        return false;
          }
        }
        return true;
    }
    var domainArray=domain.match(domainPat);
    if (domainArray==null) {
      alert("The domain name doesn't seem to be valid.");
        return false;
    }
    var atomPat=new RegExp(atom,"g");
    var domArr=domain.match(atomPat);
    var len=domArr.length;
    if ((domArr[domArr.length-1] != "info") &&
      (domArr[domArr.length-1] != "name") &&
      (domArr[domArr.length-1] != "arpa") &&
      (domArr[domArr.length-1] != "coop") &&
      (domArr[domArr.length-1] != "aero")) {
        if (domArr[domArr.length-1].length<2 ||
            domArr[domArr.length-1].length>3) {
              alert("The address must end in a three-letter domain, or two letter country.");
              return false;
        }
    }
    if (len<2) {
       var errStr="This address is missing a hostname!";
       alert(errStr);
       return false;
    }
    return true;
  }

  function UPTvalidateform1(thisform)
  {
    
    if (emailCheck1(thisform.email.value)) 
    { 

          if (document.getElementById('unsubscribe') 
              && !document.getElementById('unsubscribe').checked) {
          alert('Thank you for signing up!');
          } else {
              alert('Thank you for signing up!');
          }
      return false;
    }
    else
    {
      return true;
    }
  }