Guest rank

I have a question about my another topic for guest ranks.
The script is not working anymore, how can i fix it, i have post a guest topic here on my forum.

Code:

$(document).ready(function() {
    var totalPosts = $(".customRank").length;
 
    for (i = 0; i < totalPosts; i++) {
        temp = $(".customRank")[i].innerHTML;
        if (temp == "Gast" || temp == "Guest") {
            $(".customRank")[i].innerHTML = '<img src="https://i.servimg.com/u/f47/20/54/55/98/th/gast10.png">';
        }
    }
});

*Bump*