function ValidateEmail(sEmail)

{ 

var reEmail=/^(.+)@(.+)$/; 

var reQuotedString="(\"[^\"]*\")";

var reIPDomain=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;

var reValidCharString="\[^\\s\\(\\)><@,;:\\\\\\\"\\.\\[\\]\]+";

var reGetString="(" + reValidCharString + "|" + reQuotedString + ")";

var reUserName=new RegExp("^" + reGetString + "(\\." + reGetString + ")*$");

var reDomain=new RegExp("^" + reValidCharString + "(\\." + reValidCharString +")*$");

var reWholeCharString=new RegExp("^" + reValidCharString + "$");



var matchArray=sEmail.match(reEmail);

if (matchArray==null) return false; 

var sUsername=matchArray[1];

var sDomain=matchArray[2];



for (i=0; i<sUsername.length; i++) {

    if (sUsername.charCodeAt(i)>127) return false; 

} 

if (sUsername.match(reUserName)==null) return false;



for (i=0; i<sDomain.length; i++) {

    if (sDomain.charCodeAt(i)>127) return false;

} 



var arrIPNums=sDomain.match(reIPDomain);

if (arrIPNums!=null)

{

    for (var i=1;i<=4;i++) { 

        if (arrIPNums>255) return false; 

    }    

} 

else

{

    var arrDomains=sDomain.split(".");

    var iDomainLen=arrDomains.length;

    if (iDomainLen<2) return false; 

    for (i=0;i<iDomainLen;i++) { 

        if (arrDomains[i].search(reWholeCharString)==-1) return false; 

    } 

}

return true;

}