// some simple email validation
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() {
    var nameID = document.contact_form.name;
    if ((nameID.value == null) || (nameID.value == "")) {
        alert("Please enter your name");
        nameID.focus();
        return false;
    }
    var phoneID = document.contact_form.phone;
    if ((phoneID.value == null) || (phoneID.value == "")) {
        alert("Please enter your phone number");
        phoneID.focus();
        return false;
    }
    var emailID = document.contact_form.email;
    if ((emailID.value == null) || (emailID.value == "")) {
        alert("Please enter your email address");
        emailID.focus();
        return false;
    }
    if (echeck(emailID.value) == false) {
        emailID.value = "";
        emailID.focus();
        return false;
    }
    document.contact_form.submit();
}