window.opener javascript

I have a page that uses javascript to open another window. I want the 2nd window to close the 1st. I know that I can refer to the 1st window using window.opener but I am quite inexperienced. Can anyone show me the syntax to close the 1st window.

BTW, I know that if I wanted I could close the 1st window after a certain amount of time and achieve the same effect but, honestly, I would like to know how to use window.opener.

that would be simply:

window.opener.close();

however, if the opener is not a generated window, you will recieve a warning.
This warning can be circumvented (not in IE5.0 though), but I'm not the one to tell you how since I don't like such practices, and therefor don't want to see this knowledge spread...

Thanks for your help. It worked but some MSN users (and I suspcet AOL users) seem to still have the screen I attempted to close. I would like to try to use the setTimeout command to close the 1st window now.

Can you tell me how?

sure, for this once:

setTimeout('window.opener.close()', 1000);

(the 1000 is the timeout in milliseconds)

for more on javascript, try the references and guides @ http://devedge.netscape.com/central/javascript/

Thanks for your help and the link.