I need a javascript solution to launch only one window, with a Java Applet in it, for a given URL. I found a solution posted here on Stack Overflow - here: http://stackoverflow.com/questions/528671/javascript-window-open-only-if-the-window-does-not-already-exist

But it doesn't seem to work .. I get Error: launchApplication.winrefs is undefined Line: 29

I can't seem to post the code in this little box and make it look right below, so the code (my working code, plus the solution from above) is here: http://pastie.org/833879

Where is the error?

As I understand it, the hash or array or whatever I use to store the called references to the windows opened this way will be lost if the calling window is closed.

Is there a way to make this work even if the calling window is closed and reopened? To basically ask the browser: "Do you have a window open with the following URL?" and if so, "What is the reference to that window?" (so I can raise it).