how to disable parent window in asp.net using javascript - asp.net

i hv an asp.net form in which i have used master page, in this by clicking on one link button a popup window will be opened, my problem is i want to close a popup child window when parent form is closed.. or i should make parent form disable when child popup is active...
i got some code but its working only for IE,, please help me to work this in Google chrome
this is my code which is working For IE
in parent window i wrote like this
function topWindow() {
var popup = window.open('BranchSearch.aspx', 'mywindow', 'location=1,width=450,height=100,toolbar=0,menubar=no,resizable=no,scrollbars=no,status=no,left=340,top=340');
popup.focus();
}
and in body tag of child pop window i wrote like dis
please help me as soon as possible
thank u

You can use window.showModalDialog This will disable parent window until you close the child window.

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