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;
			pageW=( window.innerWidth / 2 );
			pageW=900;
			pageY=window.pageYOffset;			
			pageH=window.innerHeight-20;
			pageH=550;
		}
		else if (document.body){
				pageX=iecompattest().scrollLeft;
				pageW=iecompattest().offsetWidth-40;
				pageW=(iecompattest().offsetWidth  / 2 );
				pageW=900;
				pageY=iecompattest().scrollTop;
				pageH=iecompattest().offsetHeight-20;
				pageH=550;
			} 

		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);
	}
}