// Name and Email Sender Validation
// Copyright Addaptron Software

function valid_sender(box) {

if (box.sender_name.value == "") {
alert("Sorry, you have not entered your name. Please try again");
box.sender_name.focus();
return false}

if (box.sender_email.value == "") {
alert("Sorry, you have not entered your email address. Please try again");
box.sender_email.focus();
return false}

var found_at = false;
var found_dot = false;
var valid_char = true;
var non_char = '?!#$%*+/\|"^`~()[]{}<>;: ';

for (i=0; i <= box.sender_email.value.length; i++) {
if (box.sender_email.value.charAt(i) == "@") {
found_at = true}
else if (box.sender_email.value.charAt(i) == ".") {
found_dot = true}
else if (box.sender_email.value.indexOf(non_char.charAt(i),0) > -1) {
valid_char = false}
}

if (found_at && found_dot && valid_char) {} else {
alert("Sorry, you have entered an invalid email address. Please try again");
box.sender_email.focus();
return false}

return true
}