function secBoard1(n)
{
	var tli=document.getElementById("secBoard1").getElementsByTagName("li");
	var mli=document.getElementById("showsecBoard1").getElementsByTagName("div");
	
	for(i=0;i<tli.length;i++)
	{
		tli[i].className=i==n?"secBoard_2":"secBoard_1";
		mli[i].style.display=i==n?"":"none";
 	}
}