Javascript top.location.replace with and without parent iFrame

I am using a frames page, which contains the following Javascript line:

top.contentsFrame.location.replace("/main.jsp"); 

I want to run this page both inside an iFrame, as well as independenty开发者_JS百科. In an iFrame it doesn't work, because the top attribute now returns the iFrame. So it can't find "contentsFrame" anymore.

What would be the easiest way to fix this?

Cheers!

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you should use

parent.top.location.replace("/main.jsp");