//hide all tabs first
$('.tab-content').hide();
//show the first tab content
$('#tab-1').show();
$('#select-box').change(function() {
dropdown = $('#select-box').val();
//first hide all tabs again when a new option is selected
$('.tab-content').hide();
//then show the tab content of whatever option value was selected
$('#' + "tab-" + dropdown).show();
});
