function isValidEmail(field) {
var err = false;
var res;

	var arrEmail = field.split('@');
	if(arrEmail.length != 2 || arrEmail[0].length < 1)
		err = true;
	if(!err) {
		if(arrEmail[0].length > 2)
			res = arrEmail[0].search(/^[-\w][-\.\w]+[-\w]$/gi);
		else
			res = arrEmail[0].search(/^[-\w]+$/gi);
		if(res == -1)
			err = true;
	}
	if(!err) {
		var arr2Email = arrEmail[1].split('.');
		if(arr2Email.length < 2)
			err = true;
	}
	if(!err) {
		var domenTail = arr2Email.pop();
		var domen = arr2Email.join('.');
		res = domen.search(/^[-!#\$%&*+\\\/=?\.\w^`{|}~]+$/gi);
		if(res == -1)
			err = true;
		res = domenTail.search(/^[a-zA-Z]+$/gi);
		if(res == -1 || domenTail.length < 2 || domenTail.length > 6)
			err = true;
	}

	return !err;
}