var node document getElementById page_wall_posts_coun var old node inn

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var node = document.getElementById('page_wall_posts_count');var old = node.innerHTML;var intervalID = setInterval(wait, 1000);function wait() {if (node.innerHTML != old) {old = node.innerHTML;var audio = new Audio('https://www.dropbox.com/s/d5kqec3mzcknaxm/froggy-frog-text-message.mp3?dl=1'); audio.play();}};