Hi all! How to display the data from popup window into textbox on clickng a button

I have a requirement like this:
i have a text box beside that one button is there, when i click on that button some popup window should appear in that popup window there is a link when i click on that link (ex mat1)that data (mat1) has to be displayed in my text box. Please help me.
How to display the data from popup window into textbox on clickng a button. Please help me!

Check out the 'opener' variable which is filled with a reference to the window which opened the current window. From there you should be able to access the button easily.

http://www.quirksmode.org/js/croswin.html