function toCountString(sec) {
	if (sec <= 0) {
		return '00:00:00';
	}
	var day = Math.floor(sec / (60*60*24));
	var hour = Math.floor(sec % (60*60*24)/(60*60)).toString().replace(/^(\d)$/, '0$1');
	var min = Math.floor(sec % (60*60*24) / (60) % 60).toString().replace(/^(\d)$/, '0$1');
	var sec = Math.floor(sec % (60*60*24)%60%60).toString().replace(/^(\d)$/, '0$1');
	return day + 'days ' + hour + ':' + min + ':' + sec;
}
 
function updateCountdown(id, m, c) { 
	var node = document.getElementById(id);
	if (!node) {
		return false;
	}
	for (var i = 0; i < node.childNodes.length; i++) {
		node.removeChild(node.childNodes[i]);
	}
	var count = toCountString(Math.floor((m - c)/1000));
	node.appendChild(document.createTextNode(count));
}

<script type="text/javascript" src="countdown.js">
<div id="countdown"></div>
<script type="text/javascript">
	updateCountdown('countdown', new Date('March 29,2006 00:00:00'), new Date());
	setInterval("updateCountdown('countdown', new Date('March 29,2006 00:00:00'), new Date())", 1000);
</script>

<div id="countdown-1"></div>
<div id="countdown-2"></div>
<div id="countdown-3"></div>
<script type="text/javascript">
	updateAllCountdown();
	setInterval("updateAllCountdown()",1000);
 
	function updateAllCountdown(){
		updateCountdown('countdown-1', new Date('June 22,2006 00:00:00'), new Date());
		updateCountdown('countdown-2', new Date('October 1,2006 00:00:00'), new Date());
		updateCountdown('countdown-3', new Date('March 18,2007 00:00:00'), new Date());
		return true;
	}
</script>

function linkthumb(){
	var nophoto = 'http://img.simpleapi.net/img/nophoto.gif';
	var img = document.createElement('img');
	img.src = nophoto;
	img.onmouseout = function(){
		img.src=nophoto;
		img.style.display='none';
	};
	img.style.position = 'absolute';
	img.style.cursor   = 'pointer';
	img.style.display  = 'none';
	document.body.appendChild(img);
	var d = document.getElementsByTagName('div');
	for (var j = 0 ; j < d.length ; j++){
		if (d[j].className != 'body') continue;
		var a = d[j].getElementsByTagName('a');
		for (var i = 0 ; i < a.length ; i++){
			if (!a[i].href.match(/^http:/)) continue;
			if (a[i].href.match("^http://www\.example\.org/path/to/dir/")) continue;
			a[i].onmouseover=function(e){
				var link  = this.href;
				var thumb = 'http://img.simpleapi.net/small/'+link;
				img.onmouseover=function(){
					img.src=thumb;
					img.style.display='block';
				};
				img.onclick = function(){
					location.href=link;
				};
				if(document.all){
					img.style.left = document.documentElement.scrollLeft + event.x + "px";
					img.style.top  = document.documentElement.scrollTop  + event.y + "px";
				}else{
					img.style.left = e.pageX + "px";
					img.style.top  = e.pageY + "px";
				}
				img.src = thumb;
				img.style.display = 'block';
			};
			a[i].onmouseout = img.onmouseout;
		}
	}
}
if(window.addEventListener){
	window.addEventListener('load',linkthumb,false);
} else if(window.attachEvent){
	window.attachEvent('onload',linkthumb);
} else {
	window.onload=linkthumb;
}

if(a[i].href.match("^http://www\.example\.org/path/to/dir/")) continue;

Rounded("div#nifty","#377CB1","#9BD1FA"); // この1行だけで要素を角丸にすることが可能

<div id="nifty"><p>test</p></div>

var myrules = {
	'.popup' : function(el){
		var href = el.getAttribute('href');
		if (href){
			el.onclick    = function(){ window.open(href); return false;}
			el.onkeypress = function(){ window.open(href); return false;}
		}
	}
};
Behaviour.register(myrules);

<script type="text/javascript" src="behaviour.js"></script>
 
<a href="index.html">Normal</a>
<a class="popup" href="index.html">Pop up</a>

function toReadableNumber(str){
	var ret = Math.floor(str).toString();
	ret = ret.match(/./g).reverse().join("");
	ret = ret.replace(/(\d{3})/g,"$1,");
	ret = ret.match(/./g).reverse().join("").replace(/^,/,"");
	return ret;
}

<input name="hoge[]" />
<input name="hoge[]" />

<input name="hoge[0]" />
<input name="hoge[1]" />

document.forms[0].hoge[1].value;

document.forms[0].elements["hoge[1]"].value;

<input name="hoge[]" id="hoge0" />
<input name="hoge[]" id="hoge1" />

document.getElementById('hoge1').value;

document.forms[0].elements[1].value;