How to get the IE window contents which is open with javascript?

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C#

Javascript

Internet

Explorer

, +

I can use this code to get and set the contents in normal IE window:

SHDocVw.ShellWindowsClass shellWindows = new SHDocVw.ShellWindowsClass();

           foreach (SHDocVw.InternetExplorer MyIE in shellWindows)
           {
                //workflow
           }

But, if a new window is open up in this way:

<input type="button" onclick='javascript:openMaxWindow(23200074100000,"../../ptgl/billtemplate/zkfp/w_gjhdywfpe.jsp?readonly=2&id=1")'/>

And I can not use SHDocVw.shellwindows to get and set the contents. Can you help me? TKS