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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>TEST</title>
<script type="text/javascript">
function tabIndexIncrement(thisField, thatField) {
thatField.tabIndex = thisField.tabIndex + 1;
}
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</head>
<body>
<input type="text" id="iField" onfocus="tabIndexIncrement(this, document.getElementById('tField'))" />
<textarea id="tField" onfocus="tabIndexIncrement(this, document.getElementById('iField'))"></textarea>
<input type="submit" />
</body>
</html>