how do you make an element disappear when you click off of it code example

Example 1: how to make javascript make things disappear

<html>
<script type="text/javascript">
<!--
    function toggle_visibility(id) {
       var e = document.getElementById(id);
       if(e.style.display == 'block')
          e.style.display = 'none';
       else
          e.style.display = 'block';
    }
//-->
</script>
<body>
<a href="#" onclick="toggle_visibility('foo');">Click here</a>
<div id="foo">This is foo</div>
</body>
</html>

Example 2: how to make a div disappear when another button i clicked

<html>
<head>
<title></title>
<script>
function myFunction() { 
	document.getElementById("mainFrameOne").style.display="none"; 
	document.getElementById("mainFrameTwo").style.display="block"; 
}
</script>
</head>
<body>
<a id="mainFrameOne" onclick="myFunction()" href="#">
    mainFrameOne
</a>
<a id="mainFrameTwo" href="#" style="display:none;">
    mainFrameTwo
</a>
</body>
</html>

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