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<div id="dot0" style="position: absolute; visibility: hidden; height: 11; width: 11;"> 
<img src="bullet.gif" height=11 width=11> 
</div> 
<div id="dot1" style="position: absolute; height: 11; width: 11;"> 
<img src="bullet.gif" height=11 width=11> 
</div> 
<div id="dot2" style="position: absolute; height: 11; width: 11;"> 
<img src="bullet.gif" height=11 width=11> 
</div> 
<div id="dot3" style="position: absolute; height: 11; width: 11;"> 
<img src="bullet.gif" height=11 width=11> 
</div> 
<div id="dot4" style="position: absolute; height: 11; width: 11;"> 
<img src="bullet.gif" height=11 width=11> 
</div> 
<div id="dot5" style="position: absolute; height: 11; width: 11;"> 
<img src="bullet.gif" height=11 width=11> 
</div> 
<div id="dot6" style="position: absolute; height: 11; width: 11;"> 
<img src="bullet.gif" height=11 width=11> 
</div> 

<script LANGUAGE="JavaScript"> 
<!-- hide code 

var nDots = 7; 

var Xpos = 0; 
var Ypos = 0; 

// fixed time step, no relation to real time 
var DELTAT = .01; 
// size of one spring in pixels 
var SEGLEN = 10; 
// spring constant, stiffness of springs 
var SPRINGK = 10; 
// all the physics is bogus, just picked stuff to 
// make it look okay 
var MASS = 1; 
// Positive XGRAVITY pulls right, negative pulls left 
// Positive YGRAVITY pulls down, negative up 
var XGRAVITY = 0; 
var YGRAVITY = 50; 
// RESISTANCE determines a slowing force proportional to velocity 
var RESISTANCE = 10; 
// stopping criterea to prevent endless jittering 
// doesn't work when sitting on bottom since floor 
// doesn't push back so acceleration always as big 
// as gravity 
var STOPVEL = 0.1; 
var STOPACC = 0.1; 
var DOTSIZE = 11; 
// BOUNCE is percent of velocity retained when 
// bouncing off a wall 
var BOUNCE = 0.75; 

var isNetscape = navigator.appName=="Netscape"; 

// always on for now, could be played with to 
// let dots fall to botton, get thrown, etc. 
var followmouse = true; 

var dots = new Array(); 
init(); 

function init() 
{ 
var i = 0; 
for (i = 0; i < nDots; i++) { 
dots = 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) 
} 

// set their positions 
for (i = 0; i < nDots; i++) { 
dots.obj.left = dots.X; 
dots.obj.top = dots.Y; 
} 


if (isNetscape) { 
// start right away since they are positioned 
// at 0, 0 
startanimate(); 
} else { 
// let dots sit there for a few seconds 
// since they're hiding on the real bullets 
setTimeout("startanimate()", 1000); 
} 
} 



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); 
} 


// This is to line up the bullets with actual LI tags on the page 
// Had to add -DOTSIZE to X and 2*DOTSIZE to Y for IE 5, not sure why 
// Still doesn't work great 
function setInitPositions(dots) 
{ 
// initialize dot positions to be on top 
// of the bullets in the <ul> 
var startloc = document.all.tags("LI"); 
var i = 0; 
for (i = 0; i < startloc.length && i < (nDots - 1); i++) { 
dots[i+1].X = startloc.offsetLeft 
startloc.offsetParent.offsetLeft - DOTSIZE; 
dots[i+1].Y = startloc.offsetTop + 
startloc.offsetParent.offsetTop + 2*DOTSIZE; 
} 
// put 0th dot above 1st (it is hidden) 
dots[0].X = dots[1].X; 
dots[0].Y = dots[1].Y - SEGLEN; 
} 

// just save mouse position for animate() to use 
function MoveHandler(e) 
{ 
Xpos = e.pageX; 
Ypos = e.pageY; 
return true; 
} 

// just save mouse position for animate() to use 
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 on dot[j] 
function springForce(i, j, spring) 
{ 
var dx = (dots.X - dots[j].X); 
var dy = (dots.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() { 
// dots[0] follows the mouse, 
// though no dot is drawn there 
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); 
} 

// air resisitance/friction 
var resist = new vec(-dots.dx * RESISTANCE, 
-dots.dy * RESISTANCE); 

// compute new accel, including gravity 
var accel = new vec((spring.X + resist.X)/MASS + XGRAVITY, 
(spring.Y + resist.Y)/ MASS + YGRAVITY); 

// compute new velocity 
dots.dx += (DELTAT * accel.X); 
dots.dy += (DELTAT * accel.Y); 

// stop dead so it doesn't jitter when nearly still 
if (Math.abs(dots.dx) < STOPVEL && 
Math.abs(dots.dy) < STOPVEL && 
Math.abs(accel.X) < STOPACC && 
Math.abs(accel.Y) < STOPACC) { 
dots.dx = 0; 
dots.dy = 0; 
} 

// move to new position 
dots.X += dots.dx; 
dots.Y += dots.dy; 

// get size of window 
var height, width; 
if (isNetscape) { 
height = window.innerHeight + window.pageYOffset; 
width = window.innerWidth + window.pageXOffset; 
} else { 
height = document.body.clientHeight + document.body.scrollTop; 
width = document.body.clientWidth + document.body.scrollLeft; 
} 

// bounce off 3 walls (leave ceiling open) 
if (dots.Y >= height - DOTSIZE - 1) { 
if (dots.dy > 0) { 
dots.dy = BOUNCE * -dots.dy; 
} 
dots.Y = height - DOTSIZE - 1; 
} 
if (dots.X >= width - DOTSIZE) { 
if (dots.dx > 0) { 
dots.dx = BOUNCE * -dots.dx; 
} 
dots.X = width - DOTSIZE - 1; 
} 
if (dots.X < 0) { 
if (dots.dx < 0) { 
dots.dx = BOUNCE * -dots.dx; 
} 
dots.X = 0; 
} 

// move img to new position 
dots.obj.left = dots.X; 
dots.obj.top = dots.Y; 
} 
} 

// end code hiding --> 
</script> 


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