function secBoard(n)
{
for(i=0;i<mid_lx_menu.childNodes.length;i++)
mid_lx_menu.childNodes[i].className="sec1";
mid_lx_menu.childNodes[n].className="sec2";
for(i=0;i<mid_lx_main.childNodes.length;i++)
mid_lx_main.childNodes[i].style.display="none";
mid_lx_main.childNodes[n].style.display="block";
}

function secBoard1(n)
{
for(i=0;i<mid_pic_menu.childNodes.length;i++)
mid_pic_menu.childNodes[i].className="sec4";
mid_pic_menu.childNodes[n].className="sec3";
for(i=0;i<mid_pic_main.childNodes.length;i++)
mid_pic_main.childNodes[i].style.display="none";
mid_pic_main.childNodes[n].style.display="block";
}

function secBoard2(n)
{
for(i=0;i<mid2_xx_menu.childNodes.length;i++)
mid2_xx_menu.childNodes[i].className="sec6";
mid2_xx_menu.childNodes[n].className="sec5";
for(i=0;i<mid2_xx_main.childNodes.length;i++)
mid2_xx_main.childNodes[i].style.display="none";
mid2_xx_main.childNodes[n].style.display="block";
}