Check if Adblock is present - Simple and Effective

adBlockDetect.html

<div class="adsbygoogle mycontent">This is my content</div>

<script>
    setTimeout( function() {
        if ( $('.mycontent').length > 0 ) {
            if ( $('.mycontent').is(":hidden") || ! $(".mycontent").length ) {
                alert('AdBlock Detected');
            }
        }
    }, 1000);
</script>