The idea is very simple. It just needs you to know the concepts.
On the form processing page whenever u find an error just print or echo this :
<script type="text/javascript">
err_popup();
</script>
e.g. <? if( empty($_POST['firstName']) )
{
echo "<script type=\"text/javascript\">";
echo "err_popup();";
echo "</script>";
}
?>
Given that the definistion of the JS err_popup() function has been
done in the header part of the markup
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