function bgColor (obj, col) {
  obj.style.background = col;
}

function na_open_window(name, url, left, top, width, height, toolbar, menubar, statusbar, scrollbar, resizable)
{
  toolbar_str = toolbar ? 'yes' : 'no';
  menubar_str = menubar ? 'yes' : 'no';
  statusbar_str = statusbar ? 'yes' : 'no';
  scrollbar_str = scrollbar ? 'yes' : 'no';
  resizable_str = resizable ? 'yes' : 'no';

  cookie_str = document.cookie;
  cookie_str.toString();

  pos_start  = cookie_str.indexOf(name);
  pos_end    = cookie_str.indexOf('=', pos_start);

  cookie_name = cookie_str.substring(pos_start, pos_end);

  pos_start  = cookie_str.indexOf(name);
  pos_start  = cookie_str.indexOf('=', pos_start);
  pos_end    = cookie_str.indexOf(';', pos_start);

  if (pos_end <= 0) pos_end = cookie_str.length;
  cookie_val = cookie_str.substring(pos_start + 1, pos_end);
  if (cookie_name == name && cookie_val  == "done")
    return;

  window.open(url, name, 'left='+left+',top='+top+',width='+width+',height='+height+',toolbar='+toolbar_str+',menubar='+menubar_str+',status='+statusbar_str+',scrollbars='+scrollbar_str+',resizable='+resizable_str);
}

function Show(objId) {
  obj = document.getElementById(objId);
  obj.style.display='block';
}
function Hide(objId) {
  obj = document.getElementById(objId);
  obj.style.display='none';

}
function flipImages(c) {
  for (i = 1; i < (c+1); i++) {
    img = document.getElementById('img_'+i);
    if ((img.style.display=='block')) {
      img.style.display='none';

    } else {
      img.style.display='block';
    }
  }
}
function resetImages(numOfImages) {
  if (numOfImages == 0) {
    return;
  }
  for (i = 1; i < (numOfImages); i++) {
    img = document.getElementById('img_'+i);
    img.style.display='block';
  }
}