How to bypass xss with this code ?

[inscope901]

$username = $_GET['name'];
$username = str_replace("<", "&lt;", $username);
$username = str_replace('"', "&quot;", $username);
$username = str_replace("'", "&#39;", $username);
$username = str_replace("javascript", "&#39;", $username);

help me,pls.Thanks you so much