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diff --git a/html/dialog.js b/html/dialog.js
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+/**
+ * This file is part of Haketilo.
+ *
+ * Function: Showing and error/info/confirmation dialog.
+ *
+ * Copyright (C) 2022 Wojtek Kosior
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you
+ * may distribute forms of that code without the copy of the GNU
+ * GPL normally required by section 4, provided you include this
+ * license notice and, in case of non-source distribution, a URL
+ * through which recipients can access the Corresponding Source.
+ * If you modify file(s) with this exception, you may extend this
+ * exception to your version of the file(s), but you are not
+ * obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ *
+ * As a special exception to the GPL, any HTML file which merely
+ * makes function calls to this code, and for that purpose
+ * includes it by reference shall be deemed a separate work for
+ * copyright law purposes. If you modify this code, you may extend
+ * this exception to your version of the code, but you are not
+ * obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * I, Wojtek Kosior, thereby promise not to sue for violation of this file's
+ * license. Although I request that you do not make use of this code in a
+ * proprietary program, I am not going to enforce this in court.
+ */
+
+#FROM html/DOM_helpers.js IMPORT clone_template
+#FROM common/lock.js IMPORT make_lock, lock, unlock
+
+function make(on_dialog_show, on_dialog_hide)
+{
+    const dialog_context = clone_template("dialog");
+    Object.assign(dialog_context, {
+	on_dialog_show,
+	on_dialog_hide,
+	shown: false,
+	queue: 0,
+	lock: make_lock(),
+	callback: null
+    });
+
+    for (const [id, val] of [["yes", true], ["no", false], ["ok", undefined]]) {
+	const but = dialog_context[`${id}_but`];
+	but.haketilo_dialog_result = val;
+	but.addEventListener("click", e => close_dialog(dialog_context, e));
+    }
+
+    return dialog_context;
+}
+#EXPORT make
+
+function close_dialog(dialog_context, event)
+{
+    if (dialog_context.queue > 0)
+	dialog_context.callback(event.target.haketilo_dialog_result);
+}
+
+async function show_dialog(dialog_context, shown_buts_id, msg)
+{
+    dialog_context.queue++;
+
+    if (!dialog_context.shown) {
+	dialog_context.shown = true;
+	dialog_context.on_dialog_show();
+    }
+
+    await lock(dialog_context.lock);
+
+    dialog_context.msg.innerText = msg;
+    for (const buts_id of ["ask_buts", "conf_buts"]) {
+	const action = buts_id == shown_buts_id ? "remove" : "add";
+	dialog_context[buts_id].classList[action]("hide");
+    }
+
+    const result = await new Promise(cb => dialog_context.callback = cb);
+
+    if (--dialog_context.queue == 0) {
+	dialog_context.shown = false;
+	dialog_context.on_dialog_hide();
+    }
+
+    unlock(dialog_context.lock);
+
+    return result;
+}
+
+const error = (ctx, msg) => show_dialog(ctx, "conf_buts", msg);
+#EXPORT error
+
+/* info() and error() are the same for now, we might later change that. */
+const info = error;
+#EXPORT info
+
+const ask = (ctx, msg) => show_dialog(ctx, "ask_buts", msg);
+#EXPORT ask