<script>
arr = Array();
arr["key1"] = "value";
arr["key2"] = "value2";
arr["key3"] = "value3";
keys = arr.keys();
//keys = Array("key1","key2","key3");
</script>
<script>
arr["key1"] = "value";
arr["key2"] = "value2";
arr["key3"] = "value3";
keys = arr.keys();
//keys = Array("key1","key2","key3");
</script>