function showbl(n)
{
  var el = document.getElementById('bl'+n);
  var pl = document.getElementById('pl'+n);
  var ml = document.getElementById('mi'+n);
  var my = new Array();
  var i = 1;
  
  for(i=1;i<n;i=i+1)
  {
	
	my[i] = document.getElementById('bl'+i);
  }
  


  if ( el.style.display == 'none' )
    el.style.display = 'block';
  else
    if ( el.style.display == 'block' )
    el.style.display = 'none';
	
	 if ( pl.style.display == 'none' )
    pl.style.display = 'inline'
  else
    if ( pl.style.display == 'inline' )
    pl.style.display = 'none';
	
	 if ( ml.style.display == 'none' )
    ml.style.display = 'inline'
  else
    if ( ml.style.display == 'inline' )
    ml.style.display = 'none';
}