check() with g_ships added
function check() {
  var parts=[0,1,1,2,2,3,3,4,4];
  var counts=[];
  for (var i=0;i<9;i++) counts[i]=0;
  for (var id=0;id<100;id++) {
    var el=document.getElementById(id);
    var sn=el.getAttribute('sn');
    if (sn>0) {
      var a=el.getAttribute('a');
      var v=el.getAttribute('v');
      if (a==v) counts[sn]++;
    }
  }
  var n=0;
  for (var i=1;i<9;i++) {
    if (counts[i]==parts[i]) {
      n++;
      var el=document.getElementById('s'+i);
      el.style.opacity=1;
    }
  }
  g_ships=n;
}