<html>
<body>
<p id="demo"></p>
<script>
var r=Math.random();
var x=document.getElementById("demo")
if (r>0.5)
{
x.innerHTML="<a href='http://ziqiangxuetang.com'>Visit ziqiangxuetang</a>";
}
else
{
x.innerHTML="<a href='http://wwf.org'>Visit WWF</a>";
}
</script>
</body>
</html>