[didn't know if to post in Js framework forum or here, please move it if wrong ]

Hi all, I'm a newbie in this field.
I wanted to use http://jqueryui.com/datepicker/ in a website.
Yesterday I tried it and it was fine, now it won't work anymore (anywhere in the site) and I can't figure out what's wrong in my code.

Basically I just copied the source from the link above.

this is my code

Code:
<?php
session_start();
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 
<title> modifica artista </title>
<link type="text/css" rel="stylesheet" href="CSSstyle.css" title="Style" media="all" />

<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css">  
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
<script>
$(function() {
$( "#datepicker" ).datepicker({
dateFormat:'yy/mm/dd',
yearRange: "1930:2000",
changeYear: true,
changeMonth: true
});
});
</script>

<script type="text/javascript">  //this script works fine
function Indietro() {
    var answer = confirm("Attento! Se non confermi, l'inserimento non verrą eseguito.Premi OK per tornare indietro o ANNULLA per restare.")
    if (answer)
        location.href="modificaArt1.php";
}

</script>

</head>
<body>
<?php
echo '<div id="norma">';
include 'Funzioni.php';
$con=Connession();
$nome=$_POST['nomeArte'];
echo"<h10>$nome</h10>";
echo '<br><br><br><br><br>';
select_barra();
echo "<h3>Stai per modificare l'artista'</h3>";
$curdate= date("y-m-d");
$sql="SELECT * FROM cantante WHERE NomeArte = '$nome'";
$res=mysql_query($sql,$con);
if ($res==0){ 
    echo "<br>Nessun risultato";
}else{
    echo "<h4>$nome<h4><h10>(Per confermare i dati gią presenti, copiali semplicemente nella casella corrispondente)</h10>";
    echo "<table border='1' width='70%'>
        <tr>
            <th>....un po' di colonne....</th>

            <th><h10>Data di nascita</h10></th>
        </tr>";
    while($col=mysql_fetch_array($res)){
        echo"<tr>
                <td>....un po' di colonne..</td>
                <td> $col[6]</td>  // data di nascita
            </tr>
            <tr><form method='post' action='artistaModificato.php'>                     
                <td><input type='gruppo' name='gruppo'></td>
                <td><input type='Ncomponenti' name='Ncomponenti'></td>
                <td> $col[2]</td>
                <input type='hidden' name='nomeArte' value='$col[2]'>
                <td><input type='nome' name='nome'></td>
                <td><input type='cognome' name='cognome'></td>
                <td><select name='sesso'>
                        <option value='m'>m</option>
                        <option value='f'>f</option></td>
                    </select></td>
                <td><input type='dataN' name='dataN' id='datepicker'></td>  // ***** here's the call
                </tr></table>
    <br><input type='submit' value = 'Conferma'></input>
        <input type='reset' value='Reimposta'>";
    }
}
echo "<br><br>";
echo'<input type="button" name="Submit" value="Indietro" onclick="Indietro()" />';
echo'<br><br><br>';
echo '</div>';
?>

</body>
</html>
I hope u'll be able to help me as I'm going crazy with this one

thanks
B.