Shoutbox

The BIOS battery is in the bottom left or the second picture and there is a jumper next to it. So im guessing that the jumper is the BIOS reset jumper.

Also juding by the fact both chipsets (North and Southbridge) have Via wrtten on them i would guess that it is a VIA based board not SIS. Although this will have nithing to do with the BIOS.

Edit: Try and find a serial number printed on the motherboard, then search on google for a labeled diagram, and you should be able to find the correct jumper. Although as its an old board there may be no diagrams on the web