function emailCheck (emailStr) {
	//alert(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);
var email_Str=emailStr.indexOf(',');
var email_Str_at=emailStr.indexOf('@');
var email_Str_dot=emailStr.indexOf('.');
if (matchArray==null) 
{
	if(parseInt(email_Str)!=-1)
	{
	//alert("commas"); 
	alert("Email address seems incorrect (check @ and .domain)");
	//errMsg+="Email address seems incorrect (check @ and .domain)\n";
	return false;
	}
	if(parseInt(email_Str_at)==-1) 
	{
	alert("Email address seems incorrect (check @ and .domain)");
	//errMsg+="Email address seems incorrect (check @ and .domain)\n";
	return false;
	}
	if(parseInt(email_Str_dot)==-1)
	{
	alert("Email address seems incorrect (check @ and .domain)");
	//errMsg+="Email address seems incorrect (check @ and .domain)\n";
	return false;
	}
}
	var user=matchArray[1];
	//alert(user);
	
	var domain=matchArray[2];
	
	for (i=0; i<user.length; i++) 
	{
		if (user.charCodeAt(i)>127)
		{
		alert("Ths username contains invalid characters.");
		return false;
		}
	}
	for (i=0; i<domain.length; i++) {
	if (domain.charCodeAt(i)>127) {
	alert("Ths domain name contains invalid characters.");
	//errMsg+="Ths domain name contains invalid characters.\n";
	return false;
	}
	}
	if (user.match(userPat)==null) {
		
	if(parseInt(email_Str)=-1)
	{	
	alert("The email address seem to be invalid.");
	//errMsg+="The email address seem to be invalid.\n";
	return false;
	}
	}
var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
	for (var i=1;i<=4;i++) {
	if (IPArray[i]>255) {
	//errMsg+="Destination IP address is invalid!";	
	alert("Destination IP address is invalid!");
	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("The domain name seem to be invalid.");
	//errMsg+="The domain name seem to be invalid.\n";
	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.");
//errMsg+="The address must end in a well-known domain or two letter " + " country.\n";
return false;
}
if (len<2) {
//errMsg+="This address is missing a hostname!\n"	
alert("This address is missing a hostname!");
return false;
}

return true;
}