how to get jpeg original size?

[handcraftedweb]

If I get the size of an image like so

var w = $("#myPicture").width;
var h = $("#myPicture").height;

the dimensions are the image's size as displayed in the browser, which might not be the image's original size. What's the best way to get the original size of the image?

[handcraftedweb]

I think this works, create a new Image like so and the new image's width and height properties will be that of the unresized original image.

function unresizedImg ( img ) {
	var unresized = new Image();
	unresized.src =  img.src;
	return unresized;
}

I hope this isn't re-getting the jpeg over the net again. If anyone knows a better way please let me know.