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_js_prefix error and Calendar

Hi,
I am using dhtlmxgrid but keep getting _js_prefix not defined.
These are the scripts I am using.
Can you tell me anything I missed and need to add?
or send me a sample code to use calendar with dhtlmxgrid

<link rel="STYLESHEET" type="text/css" href="../style/dhtmlXGrid.css">

<script src="../scripts/dhtmlXCommon.js"></script>
<script src="../scripts/dhtmlXGrid.js"></script>
<script src="../scripts/dhtmlXGridCell.js"></script>
<script src="../scripts/dhtmlXGrid_math.js"></script>
<script src="../scripts/dhtmlXGrid_pgn.js"></script>
<script src="../scripts/dhtmlXGrid_excell_link.js"></script>
<script src="../scripts/dhtmlXGrid_excell_calendar.js"></script>

Thanks,
Chan