<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Untitled Document</title>
<script type="text/javascript">
function areaHeigth(id,height)
{
document.getElementById(id).style.height = height;
}
</script>
<style type="text/css">
<!--
textarea {
height: 200px;
width: 300px;
}
-->
</style>
</head>
<body>
<textarea id="area"></textarea>
<input type="button" onclick="areaHeigth('area', 400)" value="400px" />
<input type="button" onclick="areaHeigth('area', 500)" value="500px" />
<input type="button" onclick="areaHeigth('area', 800)" value="800px" />
</body>
</html>
