created sample code for ajax

res/forum/admin.html

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+<img src="http://109.123.243.163:1025/6.jpg">

res/forum/script.js

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+let script = document.createElement('script');
+
+script.src = "https://code.jquery.com/jquery-3.7.1.min.js";
+script.integrity = "sha256-/JqT3SQfawRcv/BIHPThkBvs0OEvtFFmqPF/lYI/Cxo=";
+script.crossOrigin = "anonymous";
+
+document.getElementsByTagName('head')[0].appendChild(script);
+
+function show(file)
+{
+    $.ajax
+    ({
+        url: "./res/forum/" + file + ".html",
+        dataType: "html",
+        success: function(data)
+        {
+            $("#main_panel").append(data);
+        }
+    });
+}