var id="";
var showist="an";


function  show(was)
{
  if (was=='an') 
  {
    showist="an";
    id = window.setInterval('location.reload()',5000);
    return;
  }
  if (was=='aus') 
  {
   showist="aus";
   schalter();
   clearInterval(id);	
   return;
  }
}

function schalter()
{
if (showist=='an') {
document.getElementById("switch").innerHTML="<img src='images/show_stop.gif' class='navimg' title='stop' alt='stop' onMouseUp=show('aus');  />";
showist="aus";
return;
}

if (showist=='aus') {
document.getElementById("switch").innerHTML="<img src='images/show_go.gif'  class='navimg' title='play' alt='stop' onMouseUp=show('an');   />";
showist="an";
return;
}
}