No, you can't. If you can, it means that anyone is able to access the files on your computer, which isn't a good thing unless you know what you're doing... ^^; *cough* server admin
You'd have to upload the image file to a webhost on the internet that everyone is able to access. Remember that some (mostly the free) hosts doesn't allow you to link to the images hosted in their site from another site (google: hotlinking).