function  secBoard(tt,n,cc)
{
for(i=0;i<tt.cells.length;i++)
tt.cells[i].className="noselect";
tt.cells[n].className="select";
for(i=0;i<cc.tBodies.length;i++)
cc.tBodies[i].style.display="none";
cc.tBodies[n].style.display="block";
}