function validateConsEmail() {
    var objEmail = document.getElementById("cons_email");
    var msg = "Please enter a valid email address.";

    if (objEmail == null) {
        //alert('Please enter a valid email address.');
        return false;
    } else {
        var consEmail = objEmail.value;
        if (consEmail == "") {
            alert(msg);
            objEmail.focus();
            return false;
        }
        else if (!ValidateEmailAddr(consEmail)) {
            alert(msg);
            //objEmail.value = "";
            objEmail.focus();
            return false;
        }
        return true;
    }
}

function ValidateEmailAddr(str) {
    var at = "@";
    var dot = ".";
    var lat = str.indexOf(at);
    var lstr = str.length;
    var ldot = str.indexOf(dot);
    if (str.indexOf(at) == -1) {
        return false;
    }

    else if (str.indexOf(at) == -1 || str.indexOf(at) == 0 || str.indexOf(at) == lstr) {
        return false;
    }

    else if (str.indexOf(dot) == -1 || str.indexOf(dot) == 0 || str.indexOf(dot) == lstr) {
        return false;
    }

    else if (str.indexOf(at, (lat + 1)) != -1) {
        return false;
    }

    else if (str.substring(lat - 1, lat) == dot || str.substring(lat + 1, lat + 2) == dot) {
        return false;
    }

    else if (str.indexOf(dot, (lat + 2)) == -1) {
        return false;
    }

    else if (str.indexOf(" ") != -1) {
        return false;
    }
    else
        return true;
}