function secBoard_1(n)
{
						
  for (i=0;i<maintable_1.tBodies.length;i++)
  maintable_1.tBodies[i].style.display="none";
  
  maintable_1.tBodies[n].style.display="block";
							
}
function secBoard_2(n)
{
  for (i=0;i<maintable_2.tBodies.length;i++)
  maintable_2.tBodies[i].style.display="none";
  
  maintable_2.tBodies[n].style.display="block";
							
}
function secBoard_3(n)
{
  for (i=0;i<maintable_3.tBodies.length;i++)
  maintable_3.tBodies[i].style.display="none";
  
  maintable_3.tBodies[n].style.display="block";
							
}
function secBoard_4(n)
{
  for (i=0;i<maintable_4.tBodies.length;i++)
  maintable_4.tBodies[i].style.display="none";
  
  maintable_4.tBodies[n].style.display="block";

  for (i=0;i<sectable_4.cells.length;i++)
  sectable_4.cells[i].className='sec';
  sectable_4.cells[n+2].className='sec2';
							
}