<script>
function show(shown, hidden) {
document.getElementById(shown).style.display='block';
document.getElementById(hidden).style.display='none';
return false;
}
</script>
<body>
<div id="Page1">
Content of page 1
<br><br>
<a href="/go.html?url=#" onclick="return show('Page2','Page1');">Show page 2</a>
</div>
<div id="Page2" style="display:none">
Content of page 2
<br><br>
<a href="/go.html?url=#" onclick="return show('Page1','Page2');">Show page 1</a>
</div>
</body>
<script>
function show(shown, hidden) {
docum