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<!DOCTYPE html>
<html>
<head>
<script>
function myFunction() {
    alert("Image loaded: " + document.getElementById("myImg").complete);
}
</script>
</head>

<body onload="myFunction()">

<p>This property returns true if the image is finished loaded, and false if not.</p>

<img id="myImg" src="compman.gif" alt="Computerman" width="107" height="98">

</body>
</html>