[jQuery] Can Jquery be used to provide an image backup system?

[cfdvlpr]

What I'd like to do is host my images remotely, but only if the remote
host is able to return my images in a short amount of time.  Can
jQuery be used to start a timer when the page is first hit and if
certain images are not loaded in X amount of seconds, then use a
different url for the images?  If so, can anyone help me get started
coding this?