[Matre]

<div id='state' style='background: #555555; height: 20px; width: 0;'>
</div>

<script type='text/javascript'>
	var speed = +prompt("Введите скорость:") / 100,
	    distance = +prompt("Введите расстояние:"),
	    e = 0;
	setTimeout(function () {
		e += speed;
		document.getElementById("state").style.width = Math.round(e) + "px";
		if (e <= distance)
			setTimeout(arguments.callee, 10);
	}, 10);
</script>