div1 hide to div2 show return to div1 timed without refresh page

Question

I am working on a web based kiosk and have no idea how do it in jquery

I use 2 divs div1 is startpage div2 menu if they mouseover a image, div1 hides and div2 comes up and shows the menu. But when people dont use the menu and walk away it needs to switch back to div 1 without refreshing the whole page. also the timed switch to div1 must start when div2 is active.

<div 
id="start" 
style="display:none; 
  position:absolute; 
  right:0px; 
  top:0px;
  width:1680px;
  height:1050px; 
  background-image:url(start/images/overlays/start_overlay.png);
  background-color:;
  padding: 0px;
  z-index:7;
  "> start content here <br> <a 
  onmouseover="ShowContent('menu'); return true;"
  href="javascript:ShowContent('menu'); HideContent('start'); ">
  [image]</a>
  <div>

<div 
id="menu" 
style="display:none; 
  position:absolute; 
  right:0px; 
  top:0px;
  width:1680px;
  height:1050px; 
  background-image:url(start/images/overlays/menu_overlay.png);
  background-color:;
  padding: 0px;
  z-index:7;
  "> Menu Content here </div>

<script type="text/javascript" language="JavaScript"><!--
function HideContent(d) {
if(d.length < 1) { return; }
document.getElementById(d).style.display = "none";
}
function ShowContent(d) {
if(d.length < 1) { return; }
document.getElementById(d).style.display = "block";
}
function ReverseContentDisplay(d) {
if(d.length < 1) { return; }
if(document.getElementById(d).style.display == "none") 
{ document.getElementById(d).style.display = "block"; }
else { document.getElementById(d).style.display = "none"; }
}
</script>

Answer 1

As I understand you want to show div1 by default, then show div2 when user begins interacting with page and go back to div1 after some time of user inactivity.

$(function(){
  var activeTime = 3000,
      activeTO;

  $(document).on("mousemove keydown scroll", function(){
    $("#div1").hide();
    $("#div2").show();
    clearTimeout(activeTO);
    activeTO = setTimeout(kioskIdle, activeTime);
  });

  function kioskIdle(){
    $("#div1").show();
    $("#div2").hide();
  }
});

Working demo: http://jsfiddle.net/rXjMV/