function toggle_subcategory(id)
{
    $('#cat_' + id).find('span').toggle();
}

function search_design()
{
    the_number = $('.design_number').val();
    if (the_number == '' || ! isFinite(the_number))
    {
        alert('Please enter a number!');
        $('.design_number').focus();
        return;
    }
    window.open('postcard/'+the_number);
}