prototype.js and mootools.js working fine individual. but when i m trying to use both of them(prototype.js and mootools.js) together so it is not working ... pls any one here how can help me...
this is my code.......

<html>
<head>
<link rel="stylesheet" media="screen" href="../calendar/styles/vlaCal-v2.1.css" type="text/css" />
    <link rel="stylesheet" media="screen" href="../calendar/styles/vlaCal-v2.1-adobe_cs3.css" type="text/css" />
    <link rel="stylesheet" media="screen" href="../calendar/styles/vlaCal-v2.1-apple_widget.css" type="text/css" />

    <script type="text/javascript" src="../calendar/jslib/mootools-1.2-core.js"></script>
    <script type="text/javascript" src="../calendar/jslib/vlaCal-v2.1.js"></script>
    <script type="text/javascript">
        window.addEvent('domready', function() 
        { 
            new vlaDatePicker('P_L_Date_Id', { separator: '-', leadingZero: false, twoDigitYear: true, offset: { y: 3 },format: 'y/m/d', twoDigitYear: false});
        }); 
    </script>
    <script type="text/javascript" src="../prototype.js"></script>
</head>
<body>
<input type="text" name="P_L_Date" id="P_L_Date_Id" onchange="Purchase_List_Fun()"/>
</body>
</html>

pls send me solution if any one have the solution.

pls any one can help me

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