I've never seen that so, it probably isn't possible but, may be. I have seen quite a bit of these pop-under windows. As soon as they pop-up, they move underneath the active window. That can be done like so:
Code:
var win=window.open('somepage.htm');
win.blur()
You can use a more involved window.open() command if you like, naming the new window, giving it properties as well if you like.
But, be careful. This type of 'stealth pop-up' is considered especially obnoxious by most users. It will drive people away from your site if the site isn't already immensely popular and it may do so even with a popular site. Also, many pop-up blockers will prevent it from working at all, especially if it isn't launched as a direct result of the user's clicking on a link and sometimes, even if it is.
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