////////////////////////////////////
//
//	fly.js
//
////////////////////////////////////

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

function checkbrOK()
{
	if(aname.indexOf("Internet Explorer") != -1 ) {
		if(aver >= 4) {
			brOK = navigator.javaEnabled();
			mie = true;
		}
	}
	if(aname.indexOf("Netscape") != -1) {
		if(aver >= 4) {
			brOK = navigator.javaEnabled();
		}
	}
}

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)
		if(!mie) {
			pageX = window.pageXOffset;
			pageY = window.pageYOffset;
			pageW = window.innerWidth;
			pageH = window.innerHeight;
		}
		else {
			pageX = window.document.body.scrollLeft;
			pageY = window.document.body.scrollTop;
			pageW = window.document.body.clientWidth;
			pageH = window.document.body.clientHeight;
		} 
		chip.xx += chip.vx;
		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 - (3 / 2 * chip.w))) {		//"chip.w" => (3 / 2 * chip.w)
			chip.xx = pageX + pageW - (3 / 2 * 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 - (3 / 2 * chip.h)) {		//"chip.h" => (3 / 2 * chip.h)
			chip.yy = pageY + pageH - (3 / 2 * 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) {
		eval("chip=" + chipname);
		if(chip.timer1 != null) {
			clearTimeout(chip.timer1)
		}
	}
}

var chip1;
function floating()
{
	checkbrOK();
	chip1 = new Chip("chip1", 140, 140);
	if(brOK) {
		movechip("chip1");
	}
}