Q1332 How can you close a child window by clicking a form button on the parent window?

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Q1332 How can you close a child window by clicking a form button on the parent window?

Assuming the child has been opened like this:

<script language="JavaScript"><!--
winId = window.open(.....);
//--></script>

Then use:

<form>
<input type="button" onClick="if (!winId.closed) winId.close()" value="Close Popup">
</form>