cross domain site in child window, get focus.

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ASP.NET

Javascript

1.I have two links, when ever user clicks on a link ,child window opens and loads the cross domain url.
If the user click it again,I want to notify user or set focus to the already opened window. How can I achieve this. I tried setting a name to the window in window.open function call, But whenever I try to access it, it return 'ACCESS IS DENIED'



I tried using an array to store already opened windows urls and if the user requests the same url, an alert message is shown. But I want to set focus to the already opened window, the user is requesting.

2.How to close all the child windows when parent window is closed?

3.How can I trigger logout button click when user closes the main window/browser?

for the first question I tried...

newWindowsArray = new Array();
       var scrwid = $(window).width(); var scrht = $(window).height(); var winhgt = scrht - 140; var winwdth = scrwid - 20;
       function OpenWindow(Target, Name) {
           if (checkItem(newWindowsArray, Target)) {
               openedWindow = window.open(Target,'_blank', 'width=' + winwdth + ',height=' + winhgt + ',status=0,toolbar=0,menubar=0,location=0,scrollbars=1,resizable=1,screenX=0,screenY=170,top=170,left=10');
               newWindowsArray[newWindowsArray.length] = Target;
               var intervalId = setInterval(function () {
                   if (openedWindow.closed) {
                       clearInterval(intervalId);
                       if (newWindowsArray.length > 0) {
                           for (i = 0; i < newWindowsArray.length; i++) {
                               removeItem(newWindowsArray, Target);
                               break;
                           }
                       }
                   }
               }, 10);

           }
       }
       function removeItem(array, item) {
           if (array.length > 0) {
               for (var i in array) {
                   if (array[i] == item) {
                       array.splice(i, 1);
                       break;
                   }
               }
           }
       }
       function checkItem(array, item) {
           if (array.length > 0) {
               for (var i in array) {
                   if (array[i] == item) {
                       alert('window already opened!');//I want to set focus to the opened window.
                       return false;
                   }
               }
               return true;
           }
           else {
               return true;
           }
       }

for 3rd question:

window.onbeforeunload:function(){triggered button click}//not working.....

same with unload function.


any suggestion is appreciated..................