function emailCheck (emailStr) {
var checkTLD=1;
var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum|Au|au)$/;

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 holdpat = ag

if (matchArray==null) {

alert("Email address seems incorrect (check @ and .'s)");
turnonbut()
return false;
}
var user=matchArray[1];
var domain=matchArray[2];



for (i=0; i<user.length; i++) {
if (user.charCodeAt(i)>127) {
alert("Ths username contains invalid characters.");
document.mailbox.page.value = holdpat
turnonbut()
return false;
   }
}
for (i=0; i<domain.length; i++) {
if (domain.charCodeAt(i)>127) {
alert("Ths domain name contains invalid characters.");
document.mailbox.page.value = holdpat
turnonbut()
return false;
   }
}

if (user.match(userPat)==null) {

alert("The username doesn't seem to be valid.");
document.mailbox.page.value = holdpat
turnonbut()
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!");
document.mailbox.page.value = holdpat
turnonbut()
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) {
document.mailbox.page.value = holdpat
alert("The domain name does not seem to be valid.");
turnonbut()
return false;
   }
}
if (checkTLD && domArr[domArr.length-1].length!=2 && 
domArr[domArr.length-1].search(knownDomsPat)==-1) {
document.mailbox.page.value = holdpat
alert("The email address must end in a well-known domain or two letter " + "country.");
turnonbut()
return false;
}

if (len<2) {
alert("This address is missing a hostname!");
document.mailbox.page.value = holdpat
turnonbut()
return false;
}
tmt_formManager('mailbox','submit()')
}