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dom - Adding an img element to a div with javascript

I am trying to add an img to the placehere div using JavaScript, however I am having no luck. Can anyone give me a hand with my code?

<html>
<script type="text/javascript">
var elem = document.createElement("img");
elem.setAttribute("src", "images/hydrangeas.jpg");
elem.setAttribute("height", "768");
elem.setAttribute("width", "1024");
elem.setAttribute("alt", "Flower");
document.getElementById("placehere").appendChild("elem");
</script>
<body>

<div id="placehere">

</div>

</body>
</html>
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document.getElementById("placehere").appendChild(elem);

not

document.getElementById("placehere").appendChild("elem");

and use the below to set the source

elem.src = 'images/hydrangeas.jpg';

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