how do the following??
Make your search by selecting the column
PHP Code:
 <script type="text/javascript">
        $(
document).ready(function() {

            $(
"#campo_filtrar").change(function () 
            {
                 $(
"#campo_filtrar option:selected").each(function () 
                  {
                        
campo_seleccionado=$(this).val();
                        
alert(campo_seleccionado);
                   });        
            });

            $(
"#tableOne").tablesorter({ debugfalsesortList: [[00]], widgets: ['zebra'] })
                        .
tablesorterPager({ container: $("#pagerOne"), positionFixedfalse })
                        .
tablesorterFilter({ filterContainer: $("#filterBoxOne"),
                            
filterClearContainer: $("#filterClearOne"),
                            
filterColumns: [0], //    Search in the selected column
                            
filterCaseSensitivefalse
                        
});
              
        });    
        
             
    
</script>              

    <table>         
...........................

                Search by: <select id='campo_filtrar'/>
                <option value='0'>Name</option>
                <option value='1'>Major</option>
                <option value='2'>Sex</option>
                <option value='3'>English</option>
                <option value='4'>Japanese</option>
                <option value='5'>Calculus</option>
                <option value='6'>Geometry</option>
                       </select>
                <input type='text' id="filterBoxOne" size='30'>      
                <img id="filterClearOne" src="_assets/img/cross.png" title="Click to clear filter." alt="Clear Filter Image" /> 
http://beckelman.net/demos/jqueryTab...g/default.aspx