<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div id="block" style="visibility: hidden; width: 400px; height: 40px; border: 1px solid black;"></div>
<textarea style="width: 300px heihgt: 200px;" onfocus="focus1();" onblur="blur1();"></textarea>
<script type="text/javascript">
var block = document.getElementById('block');
function focus1()
{
block.style.visibility = 'visible';
}
function blur1()
{
block.style.visibility = 'hidden';
}
</script>
</body>
</html>