function js(i)
{
     switch(i)
     {
         case 1:
        document.getElementById("js1").style.display="block";
        document.getElementById("js2").style.display="none";
         break;
        case 2:
        document.getElementById("js1").style.display="none";
        document.getElementById("js2").style.display="block";
        break;
     }
}


function bs(i)
{
     switch(i)
     {
         case 1:
        document.getElementById("bs1").style.display="block";
        document.getElementById("bs2").style.display="none";
         break;
        case 2:
        document.getElementById("bs1").style.display="none";
        document.getElementById("bs2").style.display="block";
         break;
     }
}


function cs(i)
{
     switch(i)
     {
        case 1:
        document.getElementById("cs1").style.display="block";
        document.getElementById("cs2").style.display="none";
         break;
        case 2:
        document.getElementById("cs1").style.display="none";
        document.getElementById("cs2").style.display="block";
        break;
     }
}