k_DizeL,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<script>
function est()
{
event.target.checked && (glv.checked = true);
}
</script>
</head>
<body>
<input type="checkbox" onchange="est()" value="3000" id="glv" />
<label for="cms">Главный чекбокс</label>
<div id="modules">
<input type="checkbox" onchange="est()" value="1000" id="otz" />
<label for="otz">1</label><br>
<input type="checkbox" onchange="est()" value="1000" id="news" />
<label for="news">2</label><br>
<input type="checkbox" onchange="est()" value="1000" id="photo" />
<label for="photo">3</label><br>
</div>
</body>
</html>