reload existing window from another window

Hi!

I have logg in page, after clicking loggin the pop up window apiears and
if user loggins it closes,
I want to reload if loggin succes ( I have handling sistem for it) ,page
were user have clicked to logg in, how do I do it?
is it possible to do it with php?

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Thanx in advance
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BTW. I know my english is not best in the word, so please stop bugging me  
about my spelling. And yes Iam sorry you don't understand what I mean, but  
there is no point to yell at me. Have a nice day.