Well, like whammmy has said, you could just leave the first window open (your goodbye page) underneath the second and when they leave see a nice goodbye...
...or get the parent window onload to close without a prompt leaving the orphan (fullscreen) window:
For example, stick these 2 pages in a folder somewhere to test.
Name this 1.html
<html>
<head>
<script>
function fullwin(){
window.open("2.html","","fullscreen")
}
onLoad = fullwin();
</script>
<script>
function bye() {
self.opener = this;
self.close()
}
</script>
</head>
<body onload="bye()">
</body>
</html>
Name this 2.html
<html>
<head>
</head>
<body bgcolor="black" style="margin:0;padding:0; overflow:hidden;">
<table align="right">
<tr>
<td>
<input type="button" value="X" style="font:bold 15 tahoma; background-color:black;color:red; border:1 ff0000 solid;height:20;width:20;cursor:hand;" onclick="window.close();"></td>
</tr>
</table>
<br><br>
<div align="center">
<span style="font:bold 88 comic sans MS; color:blue">2.html</span>
<br>
</div>
</body>
</html>
Now, when you click on 1.html in your folder, it appears the window has opened fullscreen when in reality, the first has partially loaded popping up the second (2.html) fullscreen and self-closing itself. The only way to open a window fullscreen is from a pop-up. Now, for example, you wanted the parent page to just stay there for a goodbye page after they've left the site, just take the "bye()" script out of the head and body onload. Remember to allow your visitor a way to close the child (2.html) window should they decide to leave. I've added a cool button in this example. In theory, you could have your whole site in fullscreen windows. :cool: