var nDots = 7;

if (document.all&&window.print)

document.body.style.cssText="overflow-x:hidden;overflow-y:scroll"

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();

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()", 2000);

    }

}







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;

}



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;       

    }

}