numImages = 11;
curImage = 1;

function prevImage()
{
curImage--;
if (curImage < 1) curImage=numImages;
document.largepic.src="/resources/images/" + curImage + ".jpg"
}

function nextImage()
{
curImage++;
if (curImage > numImages) curImage=1;
document.largepic.src="/resources/images/" + curImage + ".jpg"
}