var vmin=2;
  var vmax=5;
  var vr=2;
  var timer1;
  
  function iecompattest(){
  return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
  }
  
  function Chip(chipname,width,height){
   this.named=chipname;
   this.vx=vmin+vmax*Math.random();
   this.vy=vmin+vmax*Math.random();
   this.w=width+20;
   this.h=height;
   this.xx=0;
   this.yy=0;
   this.timer1=null;
  }
  
  function movechip(chipname){
  if (document.getElementById){
  eval("chip="+chipname);
     if (window.innerWidth || window.opera){
                   pageX=window.pageXOffset;
       pageW=window.innerWidth-40;
       pageY=window.pageYOffset;
       pageH=window.innerHeight-20;
      }
     else if (document.body){
                   pageX=iecompattest().scrollLeft;
       pageW=iecompattest().offsetWidth-40;
       pageY=iecompattest().scrollTop;
       pageH=iecompattest().offsetHeight-20;
      } 
  
     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();
       }
  
  document.getElementById(chip.named).style.left=chip.xx+"px";
  document.getElementById(chip.named).style.top=chip.yy+"px";
  
     chip.timer1=setTimeout("movechip('"+chip.named+"')",100);
    }
  }