var iFullCircle = 2 * Math.PI; 
var iCenterX = 0; 
var iCenterY = 0; 
var iStep = 0; 
var bRunning = 1; 
var bIsIE = (document.all); 
var iRadio;

function resizePage() { 
if (bIsIE) { 
iCenterX = (document.body.clientWidth-document.images["img1"].width)/2; 
iCenterY = (document.body.clientHeight-document.images["img1"].height)/2; 
if (!bRunning) { 
for (var iTmp=1; iTmp<=MAXIMAGES; iTmp++) { 
document.getElementById("div" + iTmp).style.left = iCenterX; 
document.getElementById("div" + iTmp).style.top = iCenterY; 
} 
} 
} 
}

function slide() { 
if (iStep < STEPS) { 
iStep++; 
iRadio = MAXRADIUS - ((MAXRADIUS/STEPS) * iStep); 
iAngulo = ((iFullCircle*SPINS) / STEPS) * iStep; 
for (var iTmp=1; iTmp<=MAXIMAGES; iTmp++) { 
document.getElementById("div" + iTmp).style.left = iCenterX + iRadio * Math.cos((iFullCircle/MAXIMAGES)*iTmp + iAngulo); 
document.getElementById("div" + iTmp).style.top = iCenterY + iRadio * Math.sin((iFullCircle/MAXIMAGES)*iTmp + iAngulo); 
document.images['img' + iTmp].filters.alpha.opacity = (100/STEPS) * iStep; 
} 
setTimeout("slide()", ITIMER); 
} else { 
bRunning = 0; 
} 
}

function initThis() { 
if (bIsIE) { 
iCenterX = (document.body.clientWidth-document.images["img1"].width)/2; 
iCenterY = (document.body.clientHeight-document.images["img1"].height)/2; 
for (var iTmp=1; iTmp<=MAXIMAGES; iTmp++) { 
document.getElementById("div" + iTmp).style.left = iCenterX + MAXRADIUS * Math.cos((iFullCircle/MAXIMAGES)*iTmp); 
document.getElementById("div" + iTmp).style.top = iCenterY + MAXRADIUS * Math.sin((iFullCircle/MAXIMAGES)*iTmp); 
document.getElementById("div" + iTmp).style.visibility = "visible"; 
} 
iRadio = MAXRADIUS; 
slide(); 
} 
} 
</script>

SCARICA
Start this script
Metti questo codice se vuoi attivarlo senza cliccare:
<body onload="initThis()" onresize="resizePage()">