How to refresh iframe after it has been loaded? [duplicate]

This question already has an answer here:

• How to refresh an IFrame using Javascript? 13 answers
• How to force an iFrame to reload once it loads 4 answers

I have an iframe that i want to refresh after it has been loaded completely. I need it to refresh every 5 seconds but each time wait until page has been loaded.

Anyone have any ideas?

Thanks