function checkForm(frm) {
    if (frm.email.value == "" || frm.email.value.indexOf("@") == -1 || frm.email.value.indexOf(".") == -1) {
        alert("Please enter your valid email address");
        frm.email.focus();
        return false;
    }

    if (frm.who.value == "") {
        alert("Please enter a little info about yourself");
        frm.who.focus();
        return false;
    }

    if (frm.notes.value == "") {
        alert("Please enter your question or proposal");
        frm.notes.focus();
        return false;
    }

    return true;
}

document.forms[0].onsubmit = new Function("return checkForm(this);");