How to get W and H of an Img

[anakintang]

in JavaScript I want to get the width and height of an image online (through url) before I put it on my HTML, how can I do it? Thanks

[agent002]

something like this?
<script>

window.onload = function(){
alert('width: '+loadImage.width+', height: '+loadImage.height);
}

var loadImage = new Image();
loadImage.src = 'image.jpg';

</script>