diff --git a/layouts/shortcodes/on-off.html b/layouts/shortcodes/on-off.html
index 4194899..5f3e2b9 100644
--- a/layouts/shortcodes/on-off.html
+++ b/layouts/shortcodes/on-off.html
@@ -16,13 +16,23 @@
       <img id={{ $id }} src="{{ $img_off }}" alt="Off">
     {{ end }}
     <script language="JavaScript">
-      var imgping = new Image();
-      imgping.src = '{{ $opt1 }}';
-      if(imgping.height>0){
-        document.getElementById("{{ $id }}").outerHTML ='<img src="{{ $img_on }}" alt="On">';
-      } else {
-        document.getElementById("{{ $id }}").outerHTML ='<img src="{{ $img_off }}" alt="Off">';
+
+      function imgping(id,url){
+        while (true) {
+          function Sleep(milliseconds) {
+            return new Promise(resolve => setTimeout(resolve, milliseconds));
+          }
+          var imgping = new Image();
+          imgping.src = url;
+          if(imgping.height>0){
+            document.getElementById(id).outerHTML ='<img src="{{ $img_on }}" alt="On">';
+          } else {
+            document.getElementById(id).outerHTML ='<img src="{{ $img_off }}" alt="Off">';
+          }
+          Sleep(15000);
+        }
       }
+      imgping({{ $id }},{{ $opt1 }});
     </script>
   {{ else }}
     imgping [URL to image] [default on/off]