function show1(box1)
{     
if (box1.style.display == "none")
{     
  box1.style.display = "";
box2.style.display = "none";
box3.style.display = "none";
box4.style.display = "none";
}
else
{     
  box1.style.display = "none";
box2.style.display = "none";
box3.style.display = "none";
box4.style.display = "none";
 }
}

function show2(box2)
{     
if (box2.style.display == "none")
{     
  box2.style.display = "";
box1.style.display = "none";
box3.style.display = "none";
box4.style.display = "none";

 }
 else
{     
  box1.style.display = "none";
box2.style.display = "none";
box3.style.display = "none";
box4.style.display = "none";
 }
}
function show3(box3)
{     
if (box3.style.display == "none")
{     
  box3.style.display = "";
box1.style.display = "none";
box2.style.display = "none";
box4.style.display = "none";

 }
else
{     
  box1.style.display = "none";
box2.style.display = "none";
box3.style.display = "none";
box4.style.display = "none";
 }
}
function show4(box4)
{     
if (box4.style.display == "none")
{     
  box4.style.display = "";
box1.style.display = "none";
box2.style.display = "none";
box3.style.display = "none";

 }
else
{     
  box1.style.display = "none";
box2.style.display = "none";
box3.style.display = "none";
box4.style.display = "none";
 }
}