diff --git a/runelite-api/src/main/java/net/runelite/api/ScriptEvent.java b/runelite-api/src/main/java/net/runelite/api/ScriptEvent.java
new file mode 100644
index 0000000000..9e4807d214
--- /dev/null
+++ b/runelite-api/src/main/java/net/runelite/api/ScriptEvent.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2017, Adam <Adam@sigterm.info>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package net.runelite.api;
+
+public interface ScriptEvent
+{
+	int MOUSE_X = -2147483647;
+	int MOUSE_Y = -2147483646;
+	int MENU_OP = -2147483644;
+	int WIDGET_ID = -2147483645;
+	int WIDGET_INDEX = -2147483643;
+	int WIDGET_TARGET_ID = -2147483642;
+	int WIDGET_TARGET_INDEX = -2147483641;
+	int KEY_CODE = -2147483640;
+	int KEY_CHAR = -2147483639;
+	String NAME =  "event_opbase";
+}
diff --git a/runelite-api/src/main/java/net/runelite/api/widgets/JavaScriptCallback.java b/runelite-api/src/main/java/net/runelite/api/widgets/JavaScriptCallback.java
new file mode 100644
index 0000000000..01786beccf
--- /dev/null
+++ b/runelite-api/src/main/java/net/runelite/api/widgets/JavaScriptCallback.java
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2017, Adam <Adam@sigterm.info>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package net.runelite.api.widgets;
+
+import net.runelite.api.ScriptEvent;
+
+@FunctionalInterface
+public interface JavaScriptCallback
+{
+	void run(ScriptEvent event);
+}
diff --git a/runelite-mixins/src/main/java/net/runelite/mixins/ScriptVMMixin.java b/runelite-mixins/src/main/java/net/runelite/mixins/ScriptVMMixin.java
index 978b9b46ba..7293f9daa1 100644
--- a/runelite-mixins/src/main/java/net/runelite/mixins/ScriptVMMixin.java
+++ b/runelite-mixins/src/main/java/net/runelite/mixins/ScriptVMMixin.java
@@ -33,6 +33,7 @@ import net.runelite.api.mixins.Inject;
 import net.runelite.api.mixins.Mixin;
 import net.runelite.api.mixins.Replace;
 import net.runelite.api.mixins.Shadow;
+import net.runelite.api.widgets.JavaScriptCallback;
 import net.runelite.rs.api.RSClient;
 import net.runelite.rs.api.RSScript;
 import net.runelite.rs.api.RSScriptEvent;
@@ -115,6 +116,13 @@ public abstract class ScriptVMMixin implements RSClient
 	@Replace("runScript")
 	static void rl$runScript(RSScriptEvent event, int maxExecutionTime)
 	{
+		Object[] arguments = event.getArguments();
+		if (arguments != null && arguments.length > 0 && arguments[0] instanceof JavaScriptCallback)
+		{
+			((JavaScriptCallback) arguments[0]).run(event);
+			return;
+		}
+
 		try
 		{
 			rs$runScript(event, maxExecutionTime);
diff --git a/runescape-api/src/main/java/net/runelite/rs/api/RSScriptEvent.java b/runescape-api/src/main/java/net/runelite/rs/api/RSScriptEvent.java
index c852d957c5..273818c2d9 100644
--- a/runescape-api/src/main/java/net/runelite/rs/api/RSScriptEvent.java
+++ b/runescape-api/src/main/java/net/runelite/rs/api/RSScriptEvent.java
@@ -24,9 +24,10 @@
  */
 package net.runelite.rs.api;
 
+import net.runelite.api.ScriptEvent;
 import net.runelite.mapping.Import;
 
-public interface RSScriptEvent
+public interface RSScriptEvent extends ScriptEvent
 {
 	@Import("params")
 	Object[] getArguments();