Fatal error: Call to a member function on a non-object

[SilentK]

I have a query that used to work before I installed 3.5 Now I get this error message whenever I load the page

Fatal error: Call to a member function on a non-object in /./././htdocs/widget.php on line 5

This is the contents of widget.php

PHP Code:

<?php
chdir('/./././htdocs/forums');
require 'global.php';

$latestThreads = $DB_site->query("
        SELECT *
        FROM " . TABLE_PREFIX . "thread AS thread
        WHERE thread.visible = 1 
        ORDER BY dateline DESC
        LIMIT 5  
       ");
$num_rows = $DB_site->num_rows($latestThreads);
while($row = $DB_site->fetch_array($latestThreads) )
{
     echo('<a href="http://www.xblteams.com/forums/showthread.php?t=' . $row[threadid] . '">' . $row[title] . '</a><br />');
} 

?>

That worked before 3.5. What changed? and what do I need to change to make it work?

Also I would like to get it so the links are formatted like this

<a href="javascript:widget.openURL('http://www.xblteams.com/forums/showthread.php?t=put thread id here')"></a>

I've tried

PHP Code:

 echo('<a href="javascript:widget.openURL('http://www.xblteams.com/forums/showthread.php?t=' . $row[threadid] . ' ')">' . $row[title] . '</a><br />'); 


but I get a parse error.
Thanks in advance.