// JavaScript Document
<!--
function sup(size)
{
var maxsize=size;
var backgroundOffset=size;
clearInterval(ScrollTimer);
ScrollTimer=window.setInterval("scrollup()",64);
return;
}

function scrollup()
{
 backgroundOffset-=1;
 if (backgroundOffset<0) backgroundOffset=maxsize;
 document.body.style.backgroundPosition="0 "+backgroundOffset;
}

function sdown(size)
{
var maxsize=size;
var backgroundOffset=0;
clearInterval(ScrollTimer);
ScrollTimer=window.setInterval("scrolldown()",64);
return;
}

function scrolldown()
{
 backgroundOffset+=1;
 if (backgroundOffset>maxsize) backgroundOffset=0;
 document.body.style.backgroundPosition="0 "+backgroundOffset;
}

var maxsize=500;
var backgroundOffset=0;
var ScrollTimer=window.setInterval("scrollup()",64);
// -->