тригер on\off - несколько div
by Qwerty_Wasd
HTML
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<body>
<a onclick="look('about'); return false;" href="#">ABOUT</a>
<a onclick="look('contacts'); return false;" href="#">CONTACTS</a>
<div style="display:none" id="about"><p>about</p></div>
<div style="display:none" id="contacts"><p>contacts</p></div>
<script>
function look(elemId) {
$('#'+elemId).toggle();
$('div').not('#'+elemId).hide();
}
</script>
</body>