Copy and paste this bit of JavaScript directly into the Address/Navigation bar of your browser:
javascript:{var R=0, x1=.1, y1=.05, x2=.25, y2=.24, x3=1.6, y3=.24, x4=300, y4=200, x5=300, y5=200, I=document.getElementsByTagName("img"), L=I.length; setInterval(function (){for(var i=0; i-L; i++){var S=I[ i ].style; S.position='absolute'; S.left=(Math.sin(R*x1+i*x2+x3)*x4+x5)+"px"; S.top=(Math.cos(R*y1+i*y2+y3)*y4+y5)+"px"}R++},5); void(0)}
or click here to try it on this page.
It's best to try this in Opera 9.
