function emailCheck (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 mailbox does not 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 does not seem to be valid.")
    return false
  }
  var atomPat=new RegExp(atom,"g")
  var domArr=domain.match(atomPat)
  var len=domArr.length
  var str1 = "travel";
  var str2 = "museum";
  //var testTravel = domArr[domArr.length-1].equalsIgnoreCase(str1);
  //var testMuseum = domArr[domArr.length-1].equalsIgnoreCase(str2);
  //alert("test for travel = "+testTravel+"\ntest for museum = "+testMuseum);
        
  if (domArr[domArr.length-1].length<2 ||
      domArr[domArr.length-1].length>4 &&
      !(domArr[domArr.length-1].equalsIgnoreCase(str1) || 
        domArr[domArr.length-1].equalsIgnoreCase(str2))) {
  	alert("The address must end in a three or four letter domain,\n two letter country code or .museum or .travel")
  	return false
  }
  if (len<2) {
    alert("This address is missing a hostname!")
    return false
  }
  return true;
}
String.prototype.equalsIgnoreCase=MatchIgnoreCase;

function MatchIgnoreCase(strTerm) {
	var strToSearch = this.toLowerCase();
	strTerm = strTerm.toLowerCase();
	if(strToSearch==strTerm) {
		return true;
	}
  else {
		return false;
	}
} //End Function