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html - Remove iframe with javascript

I am trying to remove iFrame tags in my documents. This is the function. But it don't seem to work. Here is my sample code

<script>
function removeiframe() {
            alert("Hello Lovely World");
            var markup = document.body.innerHTML;
            
            var filtered=markup.replace(/(<iframe.*?>.*?</iframe>)/g,"");
            alert("he: " + markup);
//markup = Regex.Replace(markup, @"<script.*?/script>", "", RegexOptions.IgnoreCase);
//markup = Regex.Replace(markup, @"<iframe.*?/iframe>", "", RegexOptions.IgnoreCase);
markup = filtered;
document.body.innerHTML = markup + "<hr><hr>HELLO";
        }
</script>
<body onload="removeiframe()">
    
        <iframe marginheight="0" src="http://www.hotelanswer.com" marginwidth="0" frameborder="0" height="180" scrolling="no" width="210"></iframe><br>
</body>
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Here's a script you can run that will remove all the iframes from your document. Here's an example of this working: http://jsfiddle.net/5hh9H/

var iframes = document.querySelectorAll('iframe');
for (var i = 0; i < iframes.length; i++) {
    iframes[i].parentNode.removeChild(iframes[i]);
}

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