Image() object in JavaScript and pass it the URL of the image you want preloaded. Say we have an image called heavyimagefile.jpg, which we want to ... just one image; for example, ...

As soon as you create the Image object, and set it's source, the browser starts to download. This is done asyncronously. That is, the x.src = "foo.gif" setting, doesn't halt the browser, until the ...