<!--
function secBoard(n,x,y)
{
  for(i=0;i<secTable.cells.length;i++){
    secTable.cells[i].className="sec1";
  secTable.cells[n].className="sec2";}
  for(i=0;i<mainTable.tBodies.length;i++){
    mainTable.tBodies[i].style.display="none";
  mainTable.tBodies[n].style.display="block";}
 
}function secBoard1(n,x,y)
{
  for(i=0;i<secTable1.cells.length;i++){
    secTable1.cells[i].className="sec1";
  secTable1.cells[n].className="sec2";}
  for(i=0;i<mainTable1.tBodies.length;i++){
    mainTable1.tBodies[i].style.display="none";
  mainTable1.tBodies[n].style.display="block";}
 
}
function secBoard2(n,x,y)
{
  for(i=0;i<secTable2.cells.length;i++){
    secTable2.cells[i].className="sec4";
  secTable2.cells[n].className="sec3";}
  for(i=0;i<mainTable2.tBodies.length;i++){
    mainTable2.tBodies[i].style.display="none";
  mainTable2.tBodies[n].style.display="block";}
 
}
function secBoard3(n,x,y)
{
  for(i=0;i<secTable3.cells.length;i++){
    secTable3.cells[i].className="sec4";
  secTable3.cells[n].className="sec3";}
  for(i=0;i<mainTable3.tBodies.length;i++){
    mainTable3.tBodies[i].style.display="none";
  mainTable3.tBodies[n].style.display="block";}
 
}