Hello, I'm hoping someone can offer some help on this one. I'm really struggling with the syntax for the following:

I want to have a dropdown list of countries that opens a popup window when selected. This window contains a map for the relevant country, using a passed country url parameter.

The popup is then 'repopulated' with another url when the dropdown has an onChange, using
Code JavaScript:
this.options[this.selectedIndex].value
.

I imagine I'd trigger the popup using an onclick event on the <select> tag, and then in subsequent clicks it would check that a child window exists, and if so it wouldn't retrigger.

I can do the bit where it re-populates the child window I think, but I don't know how to:

A: check for the existence of the child window
B: refer to the child window to chage its url.

Any help would be a lifesaver indeed.