iFrame in posts

open:
parser.php

find:
$a[] = '#\s*\[/quote\]\s*#i';

on the next line add:
$a[] = '#\[iframe\][\r\n]*(.*?)\s*\[/iframe\]\s*#is';

find:
$b[] = '[/quote]
'."\n";

on the next line add:
$b[] = '[iframe]$1[/iframe]'."\n";

find:
if (preg_match('#\[quote=("|"|\'|)(.*)\\1\]|\[quote\]|\[/quote\]|\[code\]|\[/code\]#i', $text))

replace with:
if (preg_match('#\[quote=("|"|\'|)(.*)\\1\]|\[quote\]|\[/quote\]|\[code\]|\[/code\]|\[iframe\]|\[/iframe\]#i', $text))

find:
'#\[url\]([^\[]*?)\[/url\]#e',

on the next line add:
'#\[iframe\]([^\[]*?)\[/iframe\]#e',

find:
'handle_url_tag(\'$1\')',

on the next line add:
'handle_iframe_tag(\'$1\')',

add a new method:

function handle_iframe_tag($url) {
    $full_url = str_replace(array(' ', '\'', '`', '"'), array('%20', '', '', ''), $url);
    if (strpos($url, 'www.') === 0)            // If it starts with www, we add http://
        $full_url = 'http://'.$full_url;
    else if (strpos($url, 'ftp.') === 0)    // Else if it starts with ftp, we add ftp://
        $full_url = 'ftp://'.$full_url;
    else if (!preg_match('#^([a-z0-9]{3,6})://#', $url)) // Else ef it doesn't start with abcdef://, we add http://
        $full_url = 'http://'.$full_url;
    return '<iframe src="'.htmlspecialchars($full_url).'">You need iframes enabled to view this.</iframe>';
}

save & reupload:
parser.php

$b[] = '[/quote]
'."\n";