Selenium selectWindow command

Hi guys,

In one of the test, i m clicking a button which causes a new window to open. When i recorded from selenium ide it gave below sequence.

selenium.click("Finish_Button");
selenum.selectWindow("browserwin");

But when am running this then selenium RC giving an error

"window is closed or not open"

After clicking button i tried giving sleep but that also didn't worked.

Please help me

Thanks
Rawat