function expand_desc(id) {
    $('#desc-col-' + id)[0].style.display = 'none';
    $('#desc-exp-' + id)[0].style.display = 'block';
}

function collapse_desc(id) {
    $('#desc-exp-' + id)[0].style.display = 'none';
    $('#desc-col-' + id)[0].style.display = 'block';
}