function  secBoard(n)
{
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  secBoard2(n)
{
for(i=0;i<secTable2.cells.length;i++)
secTable2.cells[i].className="sec1";
secTable2.cells[n].className="sec2";
for(i=0;i<mainTable2.tBodies.length;i++)
mainTable2.tBodies[i].style.display="none";
mainTable2.tBodies[n].style.display="block";
}

function  secBoard3(n)
{
for(i=0;i<secTable3.cells.length;i++)
secTable3.cells[i].className="sec1";
secTable3.cells[n].className="sec2";
for(i=0;i<mainTable3.tBodies.length;i++)
mainTable3.tBodies[i].style.display="none";
mainTable3.tBodies[n].style.display="block";
}
function close_head(){
		document.getElementById("head").style.display="none";
	}