[bes]

добавить проверок

<style>
	td {
		border: solid 1px;
	}
</style>

<table>
	<tr id="a00">
		<td>11</td>
		<td>12</td>
	</tr>
	<tr id="a01">
		<td>21</td>
		<td>22</td>
	</tr>
	<tr id="a02">
		<td>31</td>
		<td>32</td>
	</tr>
	<tr id="a03">
		<td>41</td>
		<td>42</td>
	</tr>
	<tr id="a04">
		<td>51</td>
		<td>52</td>
	</tr>
</table>
<button>hide</button>
<button>show</button>

<script>
window.onload = function () {
	var elems = document.body.children;
	var rows = elems[0].rows;
	var len = rows.length;
	
	for (var i = 0; i < len; i++) {
		rows[i].style.display = 'block';
	}
	
	function sh(first, last, mode) {
		var l = last - first;
		if (l < len) {
			var disp;
			if (mode == 'hide') {
				disp = 'none';
			} else {
				disp = 'block';
			}
			for (var i = first; i <= l; i++) {
				if (rows[i].style.display != disp) {
					rows[i].style.display = disp;
				}
			}
		}
	}
	
	elems[1].onclick = function () {
		var first = prompt('first', 1);
		var last = prompt('last', 2);
		sh(first, last, 'hide');
	}
	elems[2].onclick = function () {
		var first = prompt('first', 1);
		var last = prompt('last', 2);
		sh(first, last, 'show');
	}
}
</script>