How can I set a window's size when it is opened?

Put this as early in the <head> of the page as possible:

<script>
self.resizeTo(500,400);
</script>

Alternately you can add onload="self.resizeTo(500,400);" to the body tag, like this:

<body onload="self.resizeTo(500,400);">

Set the dimensions in the parentheses.  The first number is the width; the second is the height.

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