work timmer

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function five(){
document.getElementById("content").innerHTML='<h1>Play</h1><iframe width="560" height="315" src="http://www.youtube.com/embed/PDmNedrBxS4?autoplay=1" frameborder="1" allowfullscreen></iframe>';
setTimeout('blank();',300000);
}
function blank(){
document.getElementById("content").innerHTML='<h1>Work!</h1>';
setTimeout('five();',1200000);
}
</script></head>
<body onload="five();">
<x id='content'>
</x>
</body>