function add_images(){
    var el = document.getElementById("id_body_markdown");
    var iframe = '<iframe frameborder="0" style="border: #dddddd 1px solid;margin-left: 20px;width:330px; height:720px;" src="/luximages/insert/?textarea='+el.id+'"></iframe>';
    el.insertAdjacentHTML('afterend', iframe);
}
document.addEventListener("DOMContentLoaded", function(event) { 
    add_images();
});