how can i retrieve the url of a child window on a parent window in Micro soft IE6/IE7

Question

how can i retrieve the url of a child window on a parent window in Micro soft Internet Explorer 6 or 7?

hello every one
I am facing a problem with the IFrame, I have to load the url into IFrame and when  the user click on any link within this Iframe It will have to open a new browser window with the clicked link. So I am unable to open the clicked link from the Iframe into new browser window, When I opened clicked link from Iframe, each time it opens page(home page /first page loaded into Iframe of the url link).

1)How can I open clicked link from the Iframe into new browser.
Also I have to take the value of clicked link url from the child browser when the user close the child browser.
So
2) How can I get clicked link value into my form control eg in a TextBox from the child browser.
Thanks