var imgs = new Array(); var imgcnt = 0; var thisimg = 0;
imgs[imgcnt++] = 'pics/web/08_usmc_return/heros.jpg';
imgs[imgcnt++] = 'pics/web/08_usmc_return/three.jpg';
imgs[imgcnt++] = 'pics/web/08_usmc_return/piper.jpg';
imgs[imgcnt++] = 'pics/web/08_usmc_return/mcl.jpg';

function nextImg() {
if (document.images) {
  thisimg++;
  if (thisimg >= imgcnt) thisimg = 0;
  document.rollimg.src = imgs[thisimg];
}
}
function prevImg() {
if (document.images) {
  thisimg--;
  if (thisimg < 0) thisimg = imgcnt-1;
  document.rollimg.src = imgs[thisimg];
}
}