Ảnh động chạy theo con trỏ chuột

<script type=’text/javascript’>
/* <![CDATA[ */
if ((document.getElementById) &&
window.addEventListener || window.attachEvent){
(function(){
var e_img = new Image();
e_img.src = “http://3.bp.blogspot.com/-Iv19ZA-CI_U/Tt8YLPDQLsI/AAAAAAAAIog/ZDGWWE10Q5o/s1600/bats11.gif”;
var p_img = new Image();
p_img.src = “”;
var idx = document.images.length;
if ( document.getElementById(“pic”+idx) ||
document.getElementById(“ppl1″+idx) ||
document.getElementById(“ppl2″+idx)) idx++;
document.write(‘<img id=”eyblls’+idx+'” src=”‘+e_img.src+'” alt=”” style=”position:absolute;top:0px;left:0px;width:150px;height:120px”/>’
+'<img id=”ppl1’+idx+'” src=”‘+p_img.src+'” alt=”” style=”position:absolute;top:0px;left:0px;width:0px;height:0px”/>’
+'<img id=”ppl2’+idx+'” src=”‘+p_img.src+'” alt=”” style=”position:absolute;top:0px;left:0px;width:0px;height:0px”/>’);
var h,w,r,eyeballs,pupil1,pupil2;
var d = document;
var my = 0;
var mx = 0;
var fy = 0;
var fx = 0;
var pix = “px”;
var domWw = (typeof window.innerWidth == “number”);
var domSy = (typeof window.pageYOffset == “number”);
if (domWw) r = window;
else{
if (d.documentElement &&
typeof d.documentElement.clientWidth == “number” &&
d.documentElement.clientWidth != 0)
r = d.documentElement;
else{
if (d.body &&
typeof d.body.clientWidth == “number”)
r = d.body;
}}
function winsize(){
var oh,sy,ow,sx,rh,rw;
if (domWw){
if (d.documentElement && d.defaultView &&
typeof d.defaultView.scrollMaxY == “number”){
oh = d.documentElement.offsetHeight;
sy = d.defaultView.scrollMaxY;
ow = d.documentElement.offsetWidth;
sx = d.defaultView.scrollMaxX;
rh = oh-sy;
rw = ow-sx;
}else{
rh = r.innerHeight;
rw = r.innerWidth;
}
h = rh;
w = rw;
}
else{
h = r.clientHeight;
w = r.clientWidth;
}}
function scrl(yx){
var y,x;
if (domSy){
y = r.pageYOffset;
x = r.pageXOffset;
}
else{
y = r.scrollTop;
x = r.scrollLeft;
}
return (yx == 0)?y:x;
}
function mouse(e){
var msy = (domSy)?window.pageYOffset:0;
if (!e) e = window.event;
if (typeof e.pageY == ‘number’){
my = e.pageY – msy;
mx = e.pageX;
}
else{
my = e.clientY – msy;
mx = e.clientX;
}}
function makefollow(){
var sy = scrl(0);
var sx = scrl(1);
//Keep eyes on screen.
var chy = Math.floor(fy-50);
if (chy <= 0) chy = 0;
if (chy >= h-50) chy = h-50;

var chx=Math.floor(fx-34);
if (chx <= 0) chx = 0;
if (chx >= w-69) chx = w-69;
//eyeball1 centre.
var c1y = chy+17;
var c1x = chx+17;
//eyeball2 centre.
var c2y = chy+17;
var c2x = chx+52;
var dy1 = my – c1y;
var dx1 = mx – c1x;//80
var d1 = Math.sqrt(dy1*dy1 + dx1*dx1);
var dy2 = my – c2y;
var dx2 = mx – c2x;
var d2 = Math.sqrt(dy2*dy2 + dx2*dx2);
var ay1 = my – c1y;
var ax1 = mx – c1x;
var angle1 = Math.atan2(ay1,ax1)*180/Math.PI;
var ay2 = my – c2y;
var ax2 = mx – c2x;
var angle2 = Math.atan2(ay2,ax2)*180/Math.PI;
var dv = 1.7;
var onEyeBall1 = (d1 < 17)?d1/dv:10;
var onEyeBall2 = (d2 < 17)?d2/dv:10;
eyeballs.top = chy+sy+pix;
eyeballs.left = chx+sx+pix;
pupil1.top = c1y-6+onEyeBall1*Math.sin(angle1*Math.PI/180)+sy+pix;
pupil1.left = c1x-6+onEyeBall1*Math.cos(angle1*Math.PI/180)+sx+pix;
pupil2.top = c2y-6+onEyeBall2*Math.sin(angle2*Math.PI/180)+sy+pix;
pupil2.left = c2x-6+onEyeBall2*Math.cos(angle2*Math.PI/180)+sx+pix;
}
function move(){
dy = fy += (my-fy) * 0.05;
dx = fx += (mx-fx) * 0.05;
makefollow();
setTimeout(move,30);
}
function init(){
eyeballs = document.getElementById(“eyblls”+idx).style;
pupil1 = document.getElementById(“ppl1″+idx).style;
pupil2 = document.getElementById(“ppl2″+idx).style;
winsize();
move();
}
if (window.addEventListener){
window.addEventListener(“resize”,winsize,false);
window.addEventListener(“load”,init,false);
document.addEventListener(“mousemove”,mouse,false);
}
else if (window.attachEvent){
window.attachEvent(“onresize”,winsize);
window.attachEvent(“onload”,init);
document.attachEvent(“onmousemove”,mouse);
}
})();
}
/* ]]> */
< /script>