javascript form validation help

[NewComputer]

I need to have the following form force information to be added. NO BLANK FORMS. I want all forms to containg data and if they do not I want a pop up to open with the fields that do need to have the data filled. All the tutorials I have seen do not really help me.

Below is some of the code:

<?php
$to = "email@email.ca";
$from = "From: email@email.com\t";
$content = "Business Name: " . $_POST["business-name"] . "\r\n \r\n";
$content .= "Their Name: " . $_POST["your-name"] . "\r\n \r\n";
$content .= "Sign Address: " . $_POST["sign-address"] . "\r\n \r\n";
$content .= "Phone Number: " . $_POST["phone-number"] . "\r\n \r\n";
$content .= "Fax Number: " . $_POST["fax-number"] . "\r\n \r\n";
$content .= "Current Message: " . $_POST["current-message"] . "\r\n \r\n";
$content .= "New Message: " . $_POST["new-message"] . "\r\n \r\n";
mail($to, "Website form submission", $content);
?>

Thanks in advance for any help you may provide.

Does the .js go in this pages code?

http://www.2waysigns.com/contact.php

[mykoleary]

the .js goes in the page that actually displays the form. This looks like the page that is being posted to. BTW - it never hurts to re-check for content on the server side on the page that is posted to. A lot of folks turn JS off to get past forms and avoid uglies.