Naming window in pop up window tutorial

hi
In the centered pop up window tutorial it has an option for “target_winName” which i am trying to work out.

I have made a similar window that launches the html pop up from flash.everything is great except that if i press the button again it launches a second window on top whereas in the tutorial it reloads the same window.

I am trying to work out how to use the “target_winName” to have this effect.I know that i put a name in here but i don’t know how to name the html pop up so the flash button can correspond.

many thanks for any help on this

paulus