popup window unpon exit of domain only

I need code that make a window popup upon exit of a domain only, not on unload of any one page.


Thanks.
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jyokumCommented:
admittedly, this is some strange code... but it seems to work


<!--    closeDomain.html   -->
<html>
<head>
<script>
function checkExit(){
      var win = window.open("","","width=10,height=10");
      win.blur();
      win.document.write("<script>");
      win.document.write("setTimeout(\'checkDomain()\',1000);\n");
      win.document.write("function checkDomain(){ ");
      win.document.write("try {");
      win.document.write("if(window.opener) var x = window.opener.location.href;\n");
      win.document.write("self.close();}");
      win.document.write("catch(e){window.alert(\'you left my domain!!!\'); self.close();}");
      win.document.write("}");
      win.document.write("<\/script>");
}
</script>
</head>

<body onunload="checkExit();">
<a href="closeDomain.html">stay at domain</a><br>
<a href="http://www.experts-exchange.com">leave domain</a><br>
</body>
</html>
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