var speed = 350;
var obj = pX = pY = pos = RR = null; 

function pageWidth() 
{return window.innerWidth != null? window.innerWidth: document.documentElement && document.documentElement.clientWidth ? document.documentElement.clientWidth:document.body != null? document.body.clientWidth:null;} 
function pageHeight() {return window.innerHeight != null? window.innerHeight: document.documentElement && document.documentElement.clientHeight ? document.documentElement.clientHeight:document.body != null? document.body.clientHeight:null;} 
function posLeft() {return typeof window.pageXOffset != 'undefined' ? window.pageXOffset:document.documentElement && document.documentElement.scrollLeft? document.documentElement.scrollLeft:document.body.scrollLeft? document.body.scrollLeft:0;} 
function posTop() {return typeof window.pageYOffset != 'undefined' ? window.pageYOffset:document.documentElement && document.documentElement.scrollTop? document.documentElement.scrollTop: document.body.scrollTop?document.body.scrollTop:0;} 
function iRotate() {obj = document.getElementById('rotate');obj.style.position = 'absolute'; obj.style.visibility = 'visible'; sRotate(); rotate();} 
function sRotate() {pX = (pageWidth() - obj.offsetWidth) / 2;  pY = (pageHeight() - obj.offsetHeight) /20; RR = (pageHeight() - (pY * 2) - obj.offsetHeight) / 25; pos=1; } 
function rotate()  {if (pos > 80) pos = 1; var nX = pX + (1-Math.floor(2*Math.random()))*(Math.cos(pos * (Math.PI/40)) * RR)+Math.floor(Math.random()*6); var nY = pY + (Math.sin(pos * (Math.PI/40)) * RR+Math.floor(Math.random()*11)); obj.style.left = Math.round(nX+posLeft()) + 'px'; obj.style.top = Math.round(nY+posTop()) + 'px'; pX = nX; pY = nY; pos++; 
setTimeout ('rotate()',speed); return;} 
window.onload = iRotate; 
window.onresize = sRotate;