Index: gui/session/menu.js
===================================================================
--- gui/session/menu.js
+++ gui/session/menu.js
@@ -444,6 +444,16 @@
 		openDiplomacy();
 }
 
+function toggleReplace()
+{
+	let joinPlayerName = Engine.GetGUIObjectByName("joinPlayerName").caption;
+	let joinServer = Engine.GetGUIObjectByName("joinServer").caption;
+	let joinPort = Engine.GetGUIObjectByName("joinPort").caption;
+
+	if (startJoin(joinPlayerName, joinServer, getValidPort(joinPort)))
+		switchSetupPage("pageConnecting");
+}
+
 function openTrade()
 {
 	closeOpenDialogs();
Index: gui/session/top_panel/button_replace.xml
===================================================================
--- /dev/null
+++ gui/session/top_panel/button_replace.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<object type="button"
+	name="replaceButton"
+	size="100%-286 4 100%-258 32"
+	style="iconButton"
+	tooltip_style="sessionToolTip"
+>
+		<translatableAttribute id="tooltip">Replace</translatableAttribute>
+	<!-- TODO make the button less ugly -->
+	<object size="75%-16 10% 75% 10%+16" name="replaceButtonImage" type="image"
+	sprite="iconResetGold" ghost="true"/>
+	<action on="Press">
+		toggleReplace();
+	</action>
+</object>
+
+