diff -r 6bcb6b98155d -r 784aaf9ee179 emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/lang/System.java
--- a/emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/lang/System.java	Wed Jan 23 23:26:59 2013 +0100
+++ b/emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/lang/System.java	Mon Jan 28 12:18:24 2013 +0100
@@ -39,4 +39,10 @@
         "}"
     )
     public static native void arraycopy(Object value, int srcBegin, Object dst, int dstBegin, int count);
+
+    @JavaScriptBody(args = { "arr", "expectedSize" }, body = 
+        "while (expectedSize-- > arr.length) { arr.push(0); }; return arr;"
+    )
+    public static native byte[] expandArray(byte[] arr, int expectedSize);
+    
 }