I want to redirect to a page after previous page is fully loaded

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Hi

I have put a condition , where if an article is not found in the existing page , then it should show the message page not found and then it should redirect to home page.

But in my case it is directly going to home page even after I have given a delay of sometime so that it should hold on to Page not Found message , it is not happening.

I am using below command for giving some delay and then I am giving redirect to home page, but it's not working

"setTimeout(function() {}, 160000);" 

Please let me know what to add to make it work.