The element doesn’t exist at the time you’re attempting to set a value. You need to call this after the <h1> has been added to the DOM.
You can either move this <script> tag down further, or add your logic to a function which ought to be called when the document has been loaded:
window.onload = function() {
/* Add your logic here */
}
Demo: http://jsfiddle.net/Lr2Hm/
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