Copying images directly from the net?

It's a pain in the ass to have to download an online image to your HD before uploading it to one of the image boards. Would it be possible to add an option so you could just type the URL of an image you found somewhere online and 4chan would automatically copy it to its server and display it?

If you have Firefox, clicking "Browse" and then entering the URL there (i.e. not directly in the field on the page, but in the file selection menu) will make Firefox download the image to the temporary directory and put that URL in the file field.

Perhaps it's a bit of a hack, but it should save you some trouble.

If you've viewed an image online, you already have downloaded it to your HD, check your browser's cache.