function swap( img, isrc )
{
  if( !document.images ) return;
  document.images[img].src = isrc;
}

function go(form)
{
  var URL = document.form.grade.options[document.form.grade.selectedIndex].value;
  window.location.href = URL;
}
function openActivities(URL, name) 
{
  window.open(URL, name, 'toolbar=0,location=0, scrollbars=0, status=0, menubar=0, resizable=0, width=755,height=545');
}
function openResources(URL, name) 
{
  window.open(URL, name, 'toolbar=0,location=0, scrollbars=yes, status=0, menubar=0, resizable=yes, width=800,height=600');
}
function winopen(URL) 
{
  window.open(URL, null, 'height=545,width=755,toolbar=0,resizable=0,titlebar=0,status=0,scrollbars=0,location=0');
}