Djohan какой же вы не самостоятельный:
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var a = document.getElementsByTagName('a'), i = a.length;
while(i--){
a[i].onclick = function(i){
var dt = document.getElementsByTagName('dt');
return function(){
dt[i].style.display = (dt[i].style.display == '') ? 'block' : '';
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<style type="text/css">
dl, dt, dd {margin: 0px; padding: 0px;}
dl {border: 1px solid #DDD; float: left; margin-right: 10px; padding: 0px; width: 50px;}
dd, dt {text-align: center;}
dt {background: red; display: none; width: 50px; height: 50px;}
</style>
<dl>
<dd><a href="#">click</a></dd>
<dt>1</dt>
</dl>
<dl>
<dd><a href="#">click</a></dd>
<dt>2</dt>
</dl>
