aktive Links fett?

[mech]

<div id="link1"><a href="..." onclick=link('link1')>Link 1</a></div>

var old=0;
function link(link)
{
if(old) document.getElementById(oldlink).innerHTML=old;
old = document.getElementById(link).innerHTML
document.getElementById(link).innerHTML="<b>" + document.getElementById(link).innerHTML + "</b>";
oldlink=link;

}