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

function checkbrOK() {
	if (aname.indexOf("Internet Explorer") != -1) {
		if (aver >= 4) {
			brOK = navigator.javaEnabled();
		}
		mie = true;
		pageX = window.document.body.scrollLeft;
		pageW = window.document.body.offsetWidth - 8;
		pageY = window.document.body.scrollTop;
		pageH = window.document.body.offsetHeight;
	}
	if (aname.indexOf("Netscape") != -1) {
		if (aver >= 4) {
			brOK = navigator.javaEnabled();
		}
		pageX = window.pageXOffset;
		pageW = window.innerWidth;
		pageY = window.pageYOffset;
		pageH = window.innerHeight;
	}
}
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);		
		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", 60, 80);
	if (brOK) {
		movechip("chip1");
	}
}