function validate_required(field) {
    if (field.value==null||field.value=="") {
        return false;
    }
    else {
        return true;
    }
}

function validate_form(thisform) {
    var missingFields = "";
    if (validate_required(thisform.realname)==false) {
        if (missingFields == "") {
            thisform.realname.focus();
        }
        missingFields = missingFields + "\t- your name\n";
    }
    
    if (validate_required(thisform.phone)==false) {
        if (missingFields == "") {
            thisform.phone.focus();
        }
        missingFields = missingFields + "\t- your phone number\n";
    }
     if (validate_required(thisform.email)==false) {
        if (missingFields == "") {
            thisform.email.focus();
        }
        missingFields = missingFields + "\t- your email address\n";
    }
    
    if (missingFields != "") {
        alert("Please fill in the following fields before clicking send.\n\n" + missingFields);    
        return false;
    }
    else {    
        return true;
    }
}