function secBoard(n)
{
for(i=0;i<menu.childNodes.length;i++)
menu.childNodes[i].className="off";
menu.childNodes[n].className="on";
for(i=0;i<main.childNodes.length;i++)
main.childNodes[i].style.display="none";
main.childNodes[n].style.display="block";

}
function showAimg(i)
{
    for(var v=0;v<11;v++)
    {
        var img=document.getElementById("img_"+v);
        if(i==v)
        {
            img.style.display="block";
        }
        else
        {
            img.style.display="none";
        }
    }
}
function showindexaimge(i)
{
    for(var v=0;v<11;v++)
    {
        var img=document.getElementById("img_"+v);
        if(v==0)
        {
            img.style.display="block";
        }
        else
        {
            img.style.display="none";
        }
    }
}
function showindexaimge0()
{
     var img=document.getElementById("img_0");
     img.style.display="block";
}
function showindexaimge1()
{
     var img=document.getElementById("img_1");
     img.style.display="none";
}
function showindexaimge2()
{
     var img=document.getElementById("img_2");
     img.style.display="none";
}
function showindexaimge3()
{
     var img=document.getElementById("img_3");
     img.style.display="none";
}
function showindexaimge4()
{
     var img=document.getElementById("img_4");
     img.style.display="none";
}
function showindexaimge5()
{
     var img=document.getElementById("img_5");
     img.style.display="none";
}
function showindexaimge6()
{
     var img=document.getElementById("img_6");
     img.style.display="none";
}
function showindexaimge7()
{
     var img=document.getElementById("img_7");
     img.style.display="none";
}
function showindexaimge8()
{
     var img=document.getElementById("img_8");
     img.style.display="none";
}
function showindexaimge9()
{
     var img=document.getElementById("img_9");
     img.style.display="none";
}
function showindexaimge10()
{
     var img=document.getElementById("img_10");
     img.style.display="none";
}
function showindexaimge11()
{
     var img=document.getElementById("img_11");
     img.style.display="none";
}
function showindexaimge12()
{
     var img=document.getElementById("img_12");
     img.style.display="none";
}
function showindexaimge13()
{
     var img=document.getElementById("img_13");
     img.style.display="none";
}
function showindexaimge14()
{
     var img=document.getElementById("img_14");
     img.style.display="none";
}
function showindexaimge15()
{
     var img=document.getElementById("img_15");
     img.style.display="none";
}
function showindexaimge16()
{
     var img=document.getElementById("img_16");
     img.style.display="none";
}
function showindexaimge17()
{
     var img=document.getElementById("img_17");
     img.style.display="none";
}
function showindexaimge18()
{
     var img=document.getElementById("img_18");
     img.style.display="none";
}
function showindexaimge19()
{
     var img=document.getElementById("img_19");
     img.style.display="none";
}