Wiki

function toggle(obj) {
    var elstyle = document.getElementById(obj).style;
    var text    = document.getElementById(obj + "tog");
    if (elstyle.display == 'none') {
        elstyle.display = 'block';
        text.innerHTML = "hide";
    } else {
        elstyle.display = 'none';
        text.innerHTML = "show";
    }
}

[ <a href="#none" id="tocoultog" onclick="toggle('tocoul');" onkeypress="toggle('tocoul');">hide</a> ]
<div id="tocoul"> 토글할 내용 </div>