/**
* DHTML email validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
*/

function echeck(str) {

    var at = "@";
    var dot = ".";
    var lat = str.indexOf(at);
    var lstr = str.length;
    var ldot = str.indexOf(dot);
    if (str.indexOf(at) == -1) {
        alert("Invalid e-mail address.");
        return false;
    }

    if (str.indexOf(at) == -1 || str.indexOf(at) == 0 || str.indexOf(at) == lstr) {
        alert("Invalid e-mail address.");
        return false;
    }

    if (str.indexOf(dot) == -1 || str.indexOf(dot) == 0 || str.indexOf(dot) == lstr) {
        alert("Invalid e-mail address.");
        return false;
    }

    if (str.indexOf(at, (lat + 1)) != -1) {
        alert("Invalid e-mail address.");
        return false;
    }

    if (str.substring(lat - 1, lat) == dot || str.substring(lat + 1, lat + 2) == dot) {
        alert("Invalid e-mail address.");
        return false;
    }

    if (str.indexOf(dot, (lat + 2)) == -1) {
        alert("Invalid e-mail address.");
        return false;
    }

    if (str.indexOf(" ") != -1) {
        alert("Invalid e-mail address.");
        return false;
    }

    return true;
}

function ValidateForm(email) {
    var emailID = document.getElementById(email);

    if ((emailID.value == null) || (emailID.value == "")) {
        alert("Please enter an email address.");
        emailID.focus();
        return false;
    }
    if (echeck(emailID.value) == false) {
        emailID.value = "";
        emailID.focus();
        return false;
    }
    return true;
}