/***********************************************
* Moving Cockroach
***********************************************/

var vmin=2;
var vmax=5;
var vr=2;
var timer1;
var timer=0;
var display_interval;


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;
 display_interval = 1000*Math.random();
 display_interval = Math.floor(display_interval);
 document.getElementById(chipname).style.display = 'none'; 
document.getElementById(chipname).style.zIndex = 1000; 
}

function movechip(chipname){
if(timer > 0){
  document.getElementById(chip.named).style.display = 'block';
}
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());
   chip.vy+=vr*(Math.random());
   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";
    
   if(timer > 100){ 
      clearTimeout(chip.timer1);
      document.getElementById(chip.named).style.left = 0+'px'; 
      document.getElementById(chip.named).style.top = 0+'px';
      chip.yy = 0; chip.vy=0;
      chip.xx = 0; chip.vx=0;
      document.getElementById(chip.named).style.display = 'none';
      display_interval = 2000*Math.random();
      display_interval += 2000;
      timer = 0;
    }
   chip.timer1=setTimeout("movechip('"+chip.named+"'); timer++",display_interval);
   display_interval = 100;
  }
}