// JavaScript Document

<!-- Begin
var nDots = 2;
var Xpos = 0;
var Ypos = 0;
var DELTAT = .01;
var SEGLEN = 10;
var SPRINGK = 10;
var MASS = 1;
var GRAVITY = 50;
var RESISTANCE = 10;
var STOPVEL = 0.1;
var STOPACC = 0.1;
var DOTSIZE = 27;
var BOUNCE = 0.75;
var isNetscape = navigator.appName=="Netscape";
var followmouse = true;
var dots = new Array();

init();
function init() 
{
	var i = 0;
	for (i = 0; i < nDots; i++) 
		{
			dots[i] = new dot(i);
		}
	if (!isNetscape) {

// I only know how to read the locations of the 
// <LI> items in IE
//skip this for now
// setInitPositions(dots)
}

for (i = 0; i < nDots; i++) 
	{
		dots[i].obj.left = dots[i].X;
		dots[i].obj.top = dots[i].Y;
	}

if (isNetscape) 
	{
		startanimate();
	} 
	else 
		{
		// let dots sit there for a few seconds
		// since they're hiding on the real bullets
		setTimeout("startanimate()", 3000);
   		}
}

function dot(i) 
{
		this.X = Xpos;
		this.Y = Ypos;
		this.dx = 0;
		this.dy = 0;

	if (isNetscape) 
	{ 
		this.obj = eval("document.dot" + i);
	} 
		else 
		{
			this.obj = eval("dot" + i + ".style");
	    }
}

function startanimate() 
{  
	setInterval("animate()", 20);
}
 
function setInitPositions(dots) 
{
	var startloc = document.all.tags("LI");
	var i = 0;
	for (i = 0; i < startloc.length && i < (nDots - 1); i++) 
		{
			dots[i+1].X = startloc[i].offsetLeft
			startloc[i].offsetParent.offsetLeft - DOTSIZE;
			dots[i+1].Y = startloc[i].offsetTop +
			startloc[i].offsetParent.offsetTop + 2*DOTSIZE;
}

dots[0].X = dots[1].X;
dots[0].Y = dots[1].Y - SEGLEN;
}

function MoveHandler(e) 
{
	Xpos = e.pageX;
	Ypos = e.pageY;              
return true;
}

function MoveHandlerIE() 
{
	Xpos = window.event.x + document.body.scrollLeft;
	Ypos = window.event.y + document.body.scrollTop;            
}

if (isNetscape) 
{
	document.captureEvents(Event.MOUSEMOVE);
	document.onMouseMove = MoveHandler;
} 
	else 
	{
		document.onmousemove = MoveHandlerIE;
	}

function vec(X, Y)
{
	this.X = X;
	this.Y = Y;
}

// adds force in X and Y to spring for dot[i] on dot[j]

function springForce(i, j, spring)
{
	var dx = (dots[i].X - dots[j].X);
	var dy = (dots[i].Y - dots[j].Y);
	var len = Math.sqrt(dx*dx + dy*dy);
	if (len > SEGLEN) 
		{
			var springF = SPRINGK * (len - SEGLEN);
			spring.X += (dx / len) * springF;
			spring.Y += (dy / len) * springF;
		}
}

function animate() 
{        
	var start = 0;
	if (followmouse) 
		{
			dots[0].X = Xpos;
			dots[0].Y = Ypos;          
			start = 1;
}

for (i = start ; i < nDots; i++ ) 
{
	var spring = new vec(0, 0);
	if (i > 0) 
		{
			springForce(i-1, i, spring);
		}
	if (i < (nDots - 1)) 
		{
			springForce(i+1, i, spring);
		}
	var resist = new vec(-dots[i].dx * RESISTANCE, -dots[i].dy * RESISTANCE);
	var accel = new vec((spring.X + resist.X)/ MASS, (spring.Y + resist.Y)/ MASS + GRAVITY);
	dots[i].dx += (DELTAT * accel.X);
	dots[i].dy += (DELTAT * accel.Y);
	if (Math.abs(dots[i].dx) < STOPVEL &&
		Math.abs(dots[i].dy) < STOPVEL &&
		Math.abs(accel.X) < STOPACC &&
		Math.abs(accel.Y) < STOPACC) {
		dots[i].dx = 0;
		dots[i].dy = 0;
	}
	dots[i].X += dots[i].dx;
	dots[i].Y += dots[i].dy;
	var height, width;
	if (isNetscape) 
		{
			height = window.innerHeight + document.scrollTop;
			width = window.innerWidth + document.scrollLeft;
		} 
		else 
			{  
				height = document.body.clientHeight + document.body.scrollTop;
				width = document.body.clientWidth + document.body.scrollLeft;
			}
	if (dots[i].Y >=  height - DOTSIZE - 1) 
		{
			if (dots[i].dy > 0) 
				{
					dots[i].dy = BOUNCE * -dots[i].dy;
				}
			dots[i].Y = height - DOTSIZE - 1;
		}

	if (dots[i].X >= width - DOTSIZE) 
		{
			if (dots[i].dx > 0) 
				{
					dots[i].dx = BOUNCE * -dots[i].dx;
				}
			dots[i].X = width - DOTSIZE - 1;
		}

	if (dots[i].X < 0) 
		{
			if (dots[i].dx < 0) 
				{
					dots[i].dx = BOUNCE * -dots[i].dx;
				}
			dots[i].X = 0;
		}

	dots[i].obj.left = dots[i].X;                                    
	dots[i].obj.top =  dots[i].Y;                      
   }
}

// End -->