[UPHPU] detect iframe fresh

[Wade Preston Shearer]

> You should be able to tie into the onload event and know the  
> location of the iframe's contents - that should tell you when  
> things change, and if its a search results page. If the search  
> button has an ID or class, you can also just tie an event listener  
> to the button as well.

Interesting. I have never considered (or had reason) putting an  
onload on an iframe. I think that that might do the trick. Thanks.
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