$(document).ready(function() {
    $('#viewAll tbody tr:even').addClass('alt');
    $('#viewAll tr').click(function(){
        $(this).toggleClass('selectRow');
    });
});

<script type='text/javascript' src='includes/script.js'></script>

<script type="text/javascript">
$(document).ready(function() {
    $('#viewAll tbody tr:even').addClass('alt');
    $('#viewAll tr').click(function(){
        $(this).toggleClass('selectRow');
    });
});
</script>