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 (document.emailform.realname.value == "") {
alert(CUError[0])
return false
}

if (document.emailform.TravelerName.value == "") {
alert(CUError[8])
return false
}

if (document.emailform.TKTNumber.value == "") {
alert(CUError[9])
return false
}

// New validation

var special = /[$\\@\\\#%\^\&\*\(\)\[\]\+\,\;\_\{\}\`\~\=\|]/;

if(document.emailform.realname.value.search(special) != -1) {
alert(CUError[1]);
return false;
}

// New validation

if (matchArray==null) {
alert(CUError[2])
return false
}

var user=matchArray[1]
var domain=matchArray[2]

if (user.match(userPat)==null) {
alert(CUError[3])
return false
}

var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
for (var i=1;i<=4;i++) {
if (IPArray[i]>255) {
alert(CUError[4])
return false
}
}
return true
}

var domainArray=domain.match(domainPat)
if (domainArray==null) {
alert(CUError[5])
return false
}

var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 ||
domArr[domArr.length-1].length>4) {
alert(CUError[6])
return false
}

if (len<2) {
var errStr=CUError[7]
alert(errStr)
return false
}

return true;
}