web cam code clarification

["Ian Edwards" <i.edwards@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

Hi

Saw this code listed on another site

<img
           height=310 alt="Plymouth Webcam"
           src="C-Cheeta%20WEATHER_files/plymouth.jpg" width=412
           border=2><BR>

I'm assuming that this "web cam image" is simply a jpeg that is refreshed at 
a specific time interval??

If so any idea where I can source the refresh javascript?

thanks

Ian