function isValidEmail(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(matchArray==null) return false;
	var user=matchArray[1]
	var domain=matchArray[2]
	if(user.match(userPat)==null) return false;
	if(emailStr.indexOf("'")!=-1)  return false;

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

	//check for trailing chars on domain
	if ((domain.substring(domain.length-1,domain.length) == ' ') || (domain.substring(domain.length-1,domain.length) == '\n') || (domain.substring(domain.length-1,domain.length) == '\r'))
	{
		domain = domain.substring(0,domain.length-1);
	}
  	var domainArray=domain.match(domainPat)
	if(domainArray==null) 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>6) return false;
	if(len<2) return false;
	return true;
}