function preload () {
 if (document.images) {
  var imgs = preload.arguments;
  primgs = new Array();
  for (i=0; i<imgs.length; i++) {
   primgs[i] = new Image();
   primgs[i].src = imgs[i];
  }
 }
}
function over (id) {
 document.images[id].src = 'g/' + id + 'act.gif';
}
function _over (id) {
 document.images[id].src = 'g/' + id + '.gif';
}