Untitled

document.getElementById('myiframe').src = 'http://vimeo.com/videoid1';
document.getElementById('myiframe').src = 'http://vimeo.com/videoid2';
document.getElementById('myiframe').src = 'http://vimeo.com/videoid3';

document.getElementById('myiframe').contentWindow.location.replace('http://vimeo.com/videoid1');
document.getElementById('myiframe').contentWindow.location.replace('http://vimeo.com/videoid2');
document.getElementById('myiframe').contentWindow.location.replace('http://vimeo.com/videoid3');

<!doctype html>

<style>
iframe {
    width: 300px;
    height:300px;
}
</style>

<script>
var urls = ["http://bing.com", "http://google.com", "http://duckduckgo.com"];

function next() {
    if(urls.length==0) return;
    var original = document.getElementsByTagName("iframe")[0];
    var newFrame = document.createElement("iframe");
    newFrame.src = urls.pop();
    var parent = original.parentNode;
    parent.replaceChild(newFrame, original);
}
</script>

<p>let's test some iframes</p>
<button onclick="next()">next</button>
<iframe />

var iframe = $('#iframe')[0];
iframe.contentWindow.location.replace(newUrl);