// JScript File

function emailCheck (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("Email address seems incorrect.");
	    return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];

	for (i=0; i<user.length; i++) 
	{
	    if (user.charCodeAt(i)>127) 
	    {
	    alert("Ths email contains invalid characters.");
	    return false;
	    }
	}
	for (i=0; i<domain.length; i++) 
	{
	    if (domain.charCodeAt(i)>127) 
	    {
	    alert("Ths domain name contains invalid characters.");
	    return false;
	    }
	}

	if (user.match(userPat)==null) 
	{
	alert("The email doesn't seem to be valid.");
	return false;
	}

	/* if the e-mail address is at an IP address (as opposed to a symbolic
	host name) make sure the IP address is valid. */

	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;
	        }
	    }
	}
	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("The domain name does not seem to be valid.");
	    return false;
	    }
	}

	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1)
	{
	    alert("The address must end in a well-known domain or two letter " + "country.");
	    return false;
	}
	if (len<2)
	{
	    alert("This address is missing a hostname!");
	    return false;
	}
	return true;
}