function secBoard(n)
{
  //for(i=0;i<secTable.cells.length;i++)
  // secTable.cells[1].className="menu_1_out"; 
  //secTable.cells[n].className="menu_1_over";

   for(i=0;i<mainTable.tBodies.length;i++)
      mainTable.tBodies[i].style.display="none";
      mainTable.tBodies[n].style.display="block";
}



function secBoard2(n)
{
  //for(i=0;i<secTable.cells.length;i++)
  // secTable.cells[1].className="menu_1_out"; 
  //secTable.cells[n].className="menu_1_over";

   for(i=0;i<mainTable2.tBodies.length;i++)
      mainTable2.tBodies[i].style.display="none";
      mainTable2.tBodies[n].style.display="block";
}