by saying ?
echo error_popup(); or print error_popup;
As someone mentioned, you cannot call a javascript function from within PHP. What is meant by client side/server side is this: PHP is processed on the server before sending any content to the browser; that's server-side. Then, the server sends the HTML output of the PHP script to the browser. Any javascript you have in the output is enacted in the browser (client-side).
So, you want your PHP to output the javascript just like it might output HTML:
i.e.
echo '<script type="text/javascript">';
echo 'function error_popup() { newwin = window.open("error_popup.php","sss","height=470,width=450") }';
echo '</script>';
echo '<input type="button" onclick="error_popup()">';
Sounds to me like you need to go back and revisit the introductory pages of the PHP manual. Take a look at <http://www.php.net/introduction> and follow the subsequent pages to read more about PHP and what it can do. It'll also take you through a tutorial that's fairly helpful.
-- Regards, Ben Ramsey http://benramsey.com
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