Hide all tables without select text

http://stackoverflow.com/questions/25371852/tablesorter-hide-multiple-tables-based-on-dropdown-select/25372692#25372692

HTML

Hide all tables NOT containing: 
<select id="mysel">
    <option value="go">Choose One:</option>
    <option value="car">car</option>
    <option value="bus">bus</option>
    <option value="apple">apple</option>
    <option value="joy">joy</option>
    <option value="all">show all</option>
</select>
<table class='tablesorter' id='id_a'>
    <thead>
        <tr>
            <th class="aa"><a href='league.php?lid=17'>HREF</a>
            </th>
            <th class='num_caption' title='Spiele'>Sp</th>
            <th class='num_caption' title='Siege'>S</th>
            <th class="bb">Team</th>
        </tr>
        <tr><td class="aa">HREF</td><td>car</td><td>bus</td><td class="bb">aa1</td></tr>
        <tr><td class="aa">HREF</td><td>car</td><td>bus</td><td class="bb">aa2</td></tr>
        <tr><td class="aa">HREF</td><td>car</td><td>bus</td><td class="bb">aa3</td></tr>
    </thead>
</table>

<table class='tablesorter' id='id_b'>
    <thead>
        <tr>
            <th class="aa"><a href='league.php?lid=17'>HREF</a>
            </th>
            <th class='num_caption' title='Spiele'>Sp</th>
            <th class='num_caption' title='Siege'>S</th>
            <th class="bb">Team</th>
        </tr>
        <tr><td class="aa">HREF</td><td>joy</td><td>joy</td><td class="bb">bb1</td></tr>
        <tr><td class="aa">HREF</td><td>joy</td><td>joy</td><td class="bb">bb2</td></tr>
        <tr><td class="aa">HREF</td><td>joy</td><td>joy</td><td class="bb">bb3</td></tr>
    </thead>
</table>

<table class='tablesorter' id='id_c'>
    <thead>
        <tr>
            <th class="aa"><a href='league.php?lid=17'>HREF</a>
            </th>
            <th class='num_caption' title='Spiele'>Sp</th>
            <th class='num_caption' title='Siege'>S</th>
            <th class="bb">Team</th>
        </tr>
        <tr><td class="aa">HREF</td><td>bus</td><td>apple</td><td class="bb">cc1</td></tr>
        <tr><td class="aa">HREF</td><td>bus</td><td>apple</td><td...

CSS

table {border:1px solid grey;border-collapse:collapse;width:200px;}
table {margin:20px;}
th, td {border:1px solid grey;}
th, td {width:20px;text-align:center;}
.aa {width:50px;}
.bb {display:none;}
#id_a{background:wheat;}
#id_b{background:lavender;}
#id_c{background:paleyellow;}
#id_d{background:palegreen;}
.yell{background:yellow;}

JavaScript

/* 
http://stackoverflow.com/questions/25371852/tablesorter-hide-multiple-tables-based-on-dropdown-select
*/

$('#mysel').change(function(){
    $('table td').removeClass('yell'); //remove highlighting
    
    var i = this.value;
    if (i=='go') return false;
    if (i=='all') {$('.tablesorter').show();$('#mysel').val('go');return false;}
    
    $('.tablesorter').each(function(){
        var tid = this.id;
        var xxx = hasitem(tid, i);
//alert(xxx[0]);
        if (typeof xxx[0] == 'undefined') {
            $('#'+tid).hide();
        }else{
            $('#'+tid).show();
        }
    });
});
function hasitem(tbl, item){
//alert('Table = ' +tbl+ '  Item = ' +item);
    $("#"+tbl+ " td").filter(function() {
        return $(this).text() == item;
    }).addClass('yell');
    var tableRow = $("#"+tbl+ " td").filter(function() {
        return $(this).text() == item;
    }).closest("tr");
    return tableRow;
}