Get Back focus to Parent window control from Popup window

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Javascript

Hi all good evening,
I have parent window "ParentForm" & child window "Popup.aspx". From the parent window in a button (onClientClick") i am opening the Child window. thats ok.
Now the problem is when user is press escape that popup.aspx will close that's also i have done.
But while closing the Child window, My control focus need to be on Parent window button(btnSubmit) button. I google but not got a good idea, any body plz help me.


This is the code i am using to close the popup window

function doClose(e) {
            if (!e) e = window.event;
           
            if (e.keyCode) {
                if (e.keyCode == "27") {
                    
                    window.close();
                }
            }
            else if (e.charCode) {
            if (e.charCode == "27") {
                
                window.close();
            }
            }
        }        document.onkeydown = doClose;

The above function is called in popup.aspx (body onKeydown="doClose(evt");"


Thanks in advance, sorry for the english.