function layer_push(Layer)
{
if (Layer.style.display=="none")
  {Layer.style.display="block"}
else
  {Layer.style.display="none"}
}

function move(x,y)
{
  navigation.style.pixelLeft+=x;
  navigation.style.pixelTop+=y;
}

function makeStatic()
{
  navigation.style.pixelTop=document.body.scrollTop+0;
}

function layer_show(Layer)
{
  Layer.style.visibility="visible";
}

function layer_hidden(Layer)
{
  Layer.style.visibility="hidden";
}

function linkover(Linkname)
{
  Linkname.style.color="red"
  Linkname.style.cursor="hand"
}

function linkout(Linkname)
{
  Linkname.style.color="blue"
}

function atrue()
{
alert("答案正确！")
}

function afalse()
{
alert("您选择的答案不正确，请重新选择。")
}