diff --git a/webinterface-upload-button.js b/webinterface-upload-button.js
index 8756e2e..2efed77 100644
--- a/webinterface-upload-button.js
+++ b/webinterface-upload-button.js
@@ -1,18 +1,13 @@
 // https://github.com/rM-self-serve/webinterface-upload-button
 
-async function wait4header() {
-    for (let i=0; i<20; i++) {
-        const hgroups = document.getElementsByClassName('header-group');
-        if (hgroups.length > 1) {
-            return hgroups; 
-        }
-        await new Promise(r => setTimeout(r, 100))
-    }
-    return null;
-}
 
-async function init() {
-    var css = `.header-button-ovrd { 
+(function() {
+    'use strict';
+
+let global_is_uploading = false;
+
+function init() {
+    var css = `.header-button-ovrd {
         background-color: transparent;
     };`;
     var style = document.createElement('style');
@@ -22,8 +17,8 @@ async function init() {
         style.appendChild(document.createTextNode(css));
     }
     document.getElementsByTagName('head')[0].appendChild(style);
-    
-    const hgroups = await wait4header();
+
+    const hgroups = document.getElementsByClassName('header-group');
     const my_files_box = hgroups[0];
     my_files_box.style.flex = "10 1 auto";
 
@@ -33,25 +28,31 @@ async function init() {
     let upbtn_node = document.createElement("a");
     upbtn_node.role = "button";
     upbtn_node.id = "upbtn";
-    upbtn_node.className = hbtn_elm.classList[0];
-    upbtn_node.appendChild(hbtn_elm.firstChild.cloneNode(true));
+    upbtn_node.className = hbtn_elm ? hbtn_elm.classList[0] : "header-button";
+    if (hbtn_elm) {
+        upbtn_node.appendChild(hbtn_elm.firstChild.cloneNode(true));
+    } else {
+        const i = document.createElement("i");
+        i.className = "icon-rm_ikoner_final_action_download-98";
+        const div = document.createElement("div");
+        div.appendChild(i);
+        upbtn_node.appendChild(div);
+    }
     upbtn_node.classList.add("header-button-ovrd")
     upbtn_node.style.borderWidth = "0px 0px 0px 1px";
 
     let icon_elm = upbtn_node.firstChild.firstChild;
     icon_elm.style.transform = "rotate(180deg)";
-
     btns_elm.insertBefore(upbtn_node, hbtn_elm);
 
     upbtn_node.addEventListener("click", handleSubmit);
 }
 
-let global_is_uploading = false;
-
 async function handleSubmit(_) {
     if (global_is_uploading) {
         return;
     }
+    global_is_uploading = true;
     let input = document.createElement('input');
     input.type = 'file';
     input.multiple = true;
@@ -61,7 +62,6 @@ async function handleSubmit(_) {
 }
 
 async function input_auto_submit(input) {
-    global_is_uploading = true;
     let list_elm = document.getElementsByClassName('list')[0];
     let list_ref = list_elm.removeChild(list_elm.childNodes[1]);
     let loaderNode = document.createElement("div");
@@ -151,5 +151,13 @@ function create_list_entry(file_name) {
     return outer_div;
 }
 
+const callback = _ => {
+  if (document.getElementsByClassName("header-group").length >= 2) {
+      observer.disconnect();
+      init();
+  }
+};
 
-init()
+const observer = new MutationObserver(callback);
+observer.observe(document.body, {childList: true, subtree: true});
+})();