Email a list page using a button

OH how I wish I knew all this stuff.
I have been trying to Email a list page using a button and script and I have no success.

I had asked this question a while ago and a forum member was gracious enough to show me some php script that would capture the page and email it.
<?php

ob_start(); // start capture of html to buffer

?>
....Your Invoice page
<?php

$page_content = ob_get_contents(); // place buffer contents in variable

ob_end_clean(); // stop buffer capture
// To send HTML mail, the Content-type header must be set

$headers = 'MIME-Version: 1.0' . "\r\n";

$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";

$headers .= 'From: from_whoever <fromwhoever@domain.com.com>' . "\r\n"; //this could be done here or in the mail function itself
echo $page_content; //send page to user for viewing
mail("to_whoever@domain.com","Subject line",$page_content,$headers); // mail as html mailbody

?>
The code works perfectly, except it immediately emails the page.
I want to email the page by adding a button on the list page Email Statement.
Can anyone help me out with a script snippet to email the page after it is displayed and with a button.

Once the Email Statement is emailed I would like a message popup IF the email has been sent, or an error is something went wrong.
Any help will be greatly appreciated.