Detect if ads are loaded [closed]

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How do I detect if ads are loaded and redirect if not loaded ? Assuming I have a tag and javascript is enabled, can this be tampered ?

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Two ideas come to mind. If there's no JavaScript enabled on the page, your ads probably won't load. So you could do something like this:

<noscript>
    <meta http-equiv="refresh" content="0;url=http://example.com/noads" />
</noscript>

Some people have ad blockers, so that they can still have JS without ads. So you could create a variable in inline JS (var ads_loaded = false;), and then switch its value in the file that loads the ads (load_ads(); ads_loaded = true;). The idea is that, if the ads_loaded variable is changed, then everything else in the file was probably executed, as well.