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<body>
<div>
<span></span>
</div>
</body>
<!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></title>
<script type="text/javascript">
function editTab(e) {
var tag = e.srcElement || e.target;
if (e.keyCode == 9) {
if (typeof (tag.selectionStart) != 'undefined') {
var start = tag.selectionStart;
var scrollpos = tag.scrollTop;
tag.value = tag.value.substr(0, tag.selectionStart) + '\t' + tag.value.substr(tag.selectionEnd);
tag.selectionStart = start + 1;
tag.selectionEnd = start + 1;
tag.scrollTop = scrollpos;
} else if (document.selection && document.selection.createRange) {
var rng = document.selection.createRange();
rng.text = '\t';
rng.select();
} else {
tag.value += text;
}
tag.focus();
document.all ? e.returnValue = false : e.preventDefault();
}
}
</script>
</head>
<body>
<textarea id="aaa" cols="80" rows="20" name="input" onkeydown="editTab(event)"></textarea>
</body>
</html>