var nDots = 7;
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 = 11;
var BOUNCE = 0.75;
var isNetscape = navigator.appName=="Netscape";
var followmouse = true;
var dots = new Array();
var ie5fix1=0; 
var ie5fix2=0; 
init();

function init() {
	var i = 0;
	for (i = 0; i < nDots; i++) {
		dots[i] = new dot(i);
	}
	if (!isNetscape) {
	}
	for (i = 0; i < nDots; i++) {
		dots[i].obj.left = dots[i].X;
	dots[i].obj.top = dots[i].Y;
	}
	if (isNetscape) {
		startanimate();
	} else {
		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() {
	animation = setInterval("animate()", 10);
}
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.clientX + ie5fix1 ;
Ypos = window.event.clientY + ie5fix2;  

} 



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

}
function vec(X, Y) {
this.X = X;
this.Y = Y;
}
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++ ) {
 	if (document.all){ 
		ie5fix1=document.body.scrollLeft; 
		ie5fix2=document.body.scrollTop; 
	} 
	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 + documentHeight;
		width = window.innerWidth;
	} else {
		height = document.body.clientHeight + documentHeight;
		width = document.body.clientWidth;
	}
	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;
}
}