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textareaObject.accessKey=accessKey
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<html>
<head>
<script type="text/javascript">
function setAccessKey()
{
document.getElementById('txt1').accessKey="t"
}
</script>
</head>
<body onload="setAccessKey()">
<textarea id="txt1">
Hello world....This is a text area
</textarea>
</body>
</html>