Sendmail

Hello i currently paid for coder to create me a new function for my site, basically what it does is allows me to send an email to the person that purchased an item, this worked perfectly until i upgraded to the latest version. Below shows the code in which i have been using can anyone suggest why it no longer works with the latest version?

Any advice is much appreciated
Many thanks

[code title=””]function prag_dispatched($order) {

if(isset($_POST[‘dispatched’])) {

if($_POST[‘custom’][‘billing_email’] != ”) {
$mailto = $_POST[‘custom’][‘billing_email’];
} else {
$mailto = $_POST[‘order_email’];
}

global $CORE;
$CORE->SENDEMAIL($mailto,’custom’,$_POST[‘dispatched_subject’],$_POST[‘dispatched_message’]);
}
$out = ”;
$out .= ‘<b>Send Dispatched message</b><br />’;
$out .= ‘<input name=”dispatched” type=”checkbox” value=”yes” /> <span>Yes</span> <br /><br />’;
$out .= ‘<b>Subject</b><br />’;
$out .= ‘<input name=”dispatched_subject” type=”text” style=”width:100%” value=”” /><br />’;
$out .= ‘<b>message</b><br />’;
$out .= ‘<textarea style=”height:150px; width:100%” name=”dispatched_message”>’.strip_tags(str_replace(“<br/>”,”\r\n\r\n”,$order->order_data)).'</textarea>’;
echo $out;
}
?>[/code]