Load Random YouTube video from Playlist

HTML

<h1>Load Random YouTube video from Playlist</h1>

<div class="container"></div>
<div class="container2"></div>
<div class="container3"></div>
<div class="container4"></div>
<br/>
<br/>@RyanBrackett

CSS

* {
    font-family: arial
}

JavaScript

function RandomNumber(upper_limit) {
    return Math.round(upper_limit * Math.random());
}
var upper_limit = 1000;
var number = (RandomNumber(upper_limit));
$(".container").append(
    "<iframe width='560' height='314' src='https://www.youtube.com/channel/UC3dVwBQQfrMh3lCd5g7ryqQ" + number + "&rel=0&amp;showinfo=0&amp;iv_load_policy=3&amp;autohide=1&amp;wmode=transparent&amp;enablejsapi=1' frameborder='0' allowfullscreen></iframe>");

var number = (RandomNumber(upper_limit));
$(".container2").append(
    "<iframe width='560' height='314' src='http://www.youtube.com/embed/videoseries?list=PL3EvJSegnEDEAdgQ24d2L6Noi6d5IoorU&index=" + number + "&rel=0&amp;showinfo=0&amp;iv_load_policy=3&amp;autohide=1&amp;wmode=transparent&amp;enablejsapi=1' frameborder='0' allowfullscreen></iframe>");

var number = (RandomNumber(upper_limit));
$(".container3").append(
    "<iframe width='560' height='314' src='http://www.youtube.com/embed/videoseries?list=PL3EvJSegnEDEAdgQ24d2L6Noi6d5IoorU&index=" + number + "&rel=0&amp;showinfo=0&amp;iv_load_policy=3&amp;autohide=1&amp;wmode=transparent&amp;enablejsapi=1' frameborder='0' allowfullscreen></iframe>");

var number = (RandomNumber(upper_limit));
$(".container4").append(
    "<iframe width='560' height='314' src='http://www.youtube.com/embed/videoseries?list=PL3EvJSegnEDEAdgQ24d2L6Noi6d5IoorU&index=" + number + "&rel=0&amp;showinfo=0&amp;iv_load_policy=3&amp;autohide=1&amp;wmode=transparent&amp;enablejsapi=1' frameborder='0' allowfullscreen></iframe>");