Problema de Mootools

[geoxxx]

Problema con mootools.

Código PHP:

  <link  href="js/formcheck/theme/classic/formcheck.css" rel="stylesheet" type="text/css" >
<script src="js/formcheck/mootools.js" type="text/javascript"></script>
<script src="js/formcheck/formcheck.js" type="text/javascript"></script>
<script type="text/javascript">
    window.addEvent('domready', function(){
        new FormCheck('formindex');
    });
</script>
 
<link rel="stylesheet" href="js/datepicker/css/style.css" type="text/css" media="screen" />
<script type="text/javascript"  src="js/datepicker/_class.datePicker.js"></script>
<script type="text/javascript">
    window.addEvent('domready',function(){
        $('fecha01').datePicker({klass: 'black_datePicker'});
    });
</script>
 
<script type="text/javascript" src="js/sexyalert/sexyalertbox.v1.2.moo.js"></script>
<link rel="stylesheet" type="text/css" media="all" href="js/sexyalert/sexyalertbox.css"/> 
  

al quitar el datePicker me funciona el sexyalert... pero los dos dependen de mootools. y no funcionan juntos