<a href="javascript:pagestart()">PROVA SCRIPT</a>
<SCRIPT language=Javascript>
// Moving Objects Script
// By Virtual_Max
// 
// Permission to use, copy, modify, and distribute this software and its documentation 
// for NON-COMMERCIAL purposes and  without fee is hereby granted provided that this 
// notice appears in all copies. 
//
// VIRTUAL MAX MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE 
// SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED 
// WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR 
// NON-INFRINGEMENT. VIRTUAL MAX SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY 
// LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR 
// ITS DERIVATIVES.

var brOK=false;
var mie=false;
var aver=parseInt(navigator.appVersion.substring(0,1));
var aname=navigator.appName;

var vmin=2;
var vmax=5;
var vr=2;
var timer1;

function Chip(chipname,width,height)
{this.named=chipname;
 this.vx=vmin+vmax*Math.random();
 this.vy=vmin+vmax*Math.random();
 this.w=width;
 this.h=height;
 this.xx=0;
 this.yy=0;
 this.timer1=null;
}

function movechip(chipname)
{
 if(brOK)
  {eval("chip="+chipname);
   if(!mie)
    {pageX=window.pageXOffset;
     pageW=window.innerWidth;
     pageY=window.pageYOffset;
     pageH=window.innerHeight;
    }
   else
    {pageX=window.document.body.scrollLeft;
     pageW=window.document.body.offsetWidth-8;
     pageY=window.document.body.scrollTop;
     pageH=window.document.body.offsetHeight;
    }

chip.xx=chip.xx+chip.vx;
   chip.yy=chip.yy+chip.vy;
   
   chip.vx+=vr*(Math.random()-0.5);
   chip.vy+=vr*(Math.random()-0.5);
   if(chip.vx>(vmax+vmin))  chip.vx=(vmax+vmin)*2-chip.vx;
   if(chip.vx<(-vmax-vmin)) chip.vx=(-vmax-vmin)*2-chip.vx;
   if(chip.vy>(vmax+vmin))  chip.vy=(vmax+vmin)*2-chip.vy;
   if(chip.vy<(-vmax-vmin)) chip.vy=(-vmax-vmin)*2-chip.vy;

if(chip.xx<=pageX)
     {chip.xx=pageX;
      chip.vx=vmin+vmax*Math.random();
     }
   if(chip.xx>=pageX+pageW-chip.w)
     {chip.xx=pageX+pageW-chip.w;
      chip.vx=-vmin-vmax*Math.random();
     }
   if(chip.yy<=pageY)
     {chip.yy=pageY;
      chip.vy=vmin+vmax*Math.random();
     }
   if(chip.yy>=pageY+pageH-chip.h)
     {chip.yy=pageY+pageH-chip.h;
      chip.vy=-vmin-vmax*Math.random();
     }

if(!mie)
      {eval('document.'+chip.named+'.top ='+chip.yy);
       eval('document.'+chip.named+'.left='+chip.xx);
      } 
   else
      {eval('document.all.'+chip.named+'.style.pixelLeft='+chip.xx);
       eval('document.all.'+chip.named+'.style.pixelTop ='+chip.yy); 
      }
   chip.timer1=setTimeout("movechip('"+chip.named+"')",100);
  }
}

function stopme(chipname)
{if(brOK)
  {//alert(chipname)
   eval("chip="+chipname);
   if(chip.timer1!=null)
    {clearTimeout(chip.timer1)}
  }
}

var chip1;

function pagestart()
{checkbrOK(); 
 chip1=new Chip("chip1",12,12);

if(brOK) 
   { movechip("chip1");

}
}
</SCRIPT>
<DIV id=chip1 style="HEIGHT: 30px; POSITION: absolute; WIDTH: 98px"><IMG 
border=0 src="http://www.js-examples.com/js/pic1.gif">
</DIV>

SCARICA PROVA SCRIPT