Not sure what you mean, but as far as I can tell, you're saying that images loaded with JavaScript won't be cached by browser(>>cached locally<<)? Though I'm not a JavaScript Ninja, but I think that JS loads images by manipulating the DOM of a page: creating new elements, changing attributes/style. If that's what you mean, then I'm sure that all modern browsers cache these images as well. Or have I completely misunderstood you?