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

function iecompattest(){
return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function pankh(pankhname,width,height){
 this.named=pankhname;
 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 movepankh(pankhname){
if (document.getElementById){
eval("pankh="+pankhname);
   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;
    } 

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

   if(pankh.xx<=pageX){
			pankh.xx=pageX;
      pankh.vx=vmin+vmax*Math.random();
     }
   if(pankh.xx>=pageX+pageW-pankh.w){
			pankh.xx=pageX+pageW-pankh.w;
      pankh.vx=-vmin-vmax*Math.random();
     }
   if(pankh.yy<=pageY)
     {pankh.yy=pageY;
      pankh.vy=vmin+vmax*Math.random();
     }
   if(pankh.yy>=pageY+pageH-pankh.h)
     {pankh.yy=pageY+pageH-pankh.h;
      pankh.vy=-vmin-vmax*Math.random();
     }
     document.getElementById(pankh.named).style.left=pankh.xx+"px";
     document.getElementById(pankh.named).style.top=pankh.yy+"px";

   pankh.timer1=setTimeout("movepankh('"+pankh.named+"')",100);
  }
}