Does anybody knows how to open a popup window, let the user choose something > out of a list and return this value back to the form which opened the popup window?
You have two approaches.
1) The popup sends its values back to the parent browser window, which means it has to know the name of the parent. You use javascript to accomplish this. You can get a handle to the parent window by a javascript call from the parent after the popup initializes. Or
How can I send values to the parent browser window? Do you mean reloading the parent page and sending the values with the url?
2) The popup submits a form with the selection to the server, and the target of the form is set to the original browser window (which likewise has to be named with a known name). The new page from the server replaces the original page.
Tom.