How do I make a window "pop under" when it is opened?
Put this as early in the <head> of the page as possible:
<script>
self.blur();
</script>Alternately you can add onload="self.blur();" to the body tag, like this:
<body onload="self.blur();">
That tells the window to "lose focus" as soon as it reads the self.blur(); -- which makes the window "jump behind" the window that is currently in focus.