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diff --git a/src/javax/media/j3d/IndexedObject.java b/src/javax/media/j3d/IndexedObject.java
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+/*
+ * Copyright 2001-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package javax.media.j3d;
+
+/**
+ * Class used for IndexedUnorderedList
+ */
+
+abstract class IndexedObject extends Object {
+
+    /**
+     * A 2D array listIdx[3][len] is used.
+     * The entry listIdx[0][], listIdx[0][1] is used for each VirtualUniverse.
+     * The entry listIdx[2][0] is used for index to which one to use.
+     *
+     * This is used to handle the case the Node Object move from
+     * one VirtualUniverse A to another VirtualUniverse B.
+     * It is possible that another Structures in B may get the add
+     * message first before the Structures in A get the remove
+     * message to clear the entry. This cause MT problem. So a
+     * 2D array is used to resolve it.
+     */
+    int[][] listIdx;
+
+    abstract VirtualUniverse getVirtualUniverse();
+
+    synchronized int getIdxUsed(VirtualUniverse u) {
+	int idx = listIdx[2][0];
+	if (u == getVirtualUniverse()) {
+	    return idx;
+	}
+	return (idx == 0 ? 1 : 0);
+    }
+
+    void incIdxUsed() {
+	if (listIdx[2][0] == 0) {
+	    listIdx[2][0] = 1;
+	} else {
+	    listIdx[2][0] = 0;
+	}
+    }
+}
+
+