<a href='#' onclick = '$(this).toggleClass('hidden'); return false;'>Some link</a>

.hidden{display: none;}

<a href = '' onclick='showSome(this)' target ='additional'>Some description</a>

function showSome(obj){
    obj.style.display = 'none';
    var target = obj.getAttribute('target');
    document.getElementById(target).style.display = 'block';
    return false;
}