function swch(block_id) {
  if (document.getElementById('block'+block_id).style.display=='block') {
	document.getElementById('block'+block_id).style.display = 'none';
	document.getElementById('block'+block_id+'_swch').className = 'dd-link';
  } else {
	document.getElementById('block'+block_id).style.display = 'block';
	document.getElementById('block'+block_id+'_swch').className = 'dd-link';
  }
  return false;
}