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<html>
<body>
<input type="checkbox" id="myCheckBox" value="checkbox" checked>
Indeterminate = true.
<input type="button" value="Checkbox state" onClick="function1();">
<script language="JavaScript">
document.all.myCheckBox.indeterminate = true;
function function1() {
var m = document.all.myCheckBox.indeterminate;
alert("Indeterminate: "+m);
}
</script>
</body>
</html>
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