Lo script da inserire in html
<body background="nuvole.jpg">
<script language="Javascript">
<!--
// please keep these lines on when you copy the source
// made by: Nicolas - http://www.javascript-page.com
var background = "nuvole.jpg"
var speed = 10;
browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if (browserName != "Netscape" || browserVer >= 4.5) {
function moveback(movert,movedn,hPos,vPos) {
if (arguments[4])
document.body.style.backgroundImage = "url(\"" + arguments[4] + "\")";
if (arguments[5])
document.body.style.backgroundRepeat = arguments[5]
if (!isNaN(hPos)) {
if ((movert!=0) && (hPos>0)) hPos=-100000
hPos += movert
}
if (!isNaN(vPos)) {
if ((movedn!=0) && (vPos>0)) vPos=-100000
vPos+= movedn
}
document.body.style.backgroundPosition= hPos + " " + vPos
if (isNaN(hPos)) hPos = "\"" + hPos + "\""
if (isNaN(vPos)) vPos = "\"" + vPos + "\""
setTimeout("moveback("+movert+","+movedn+","+hPos+","+vPos+")",speed)
}
moveback(1,1,0,0, background);
}
//-->
</script>
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