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mouse tracking


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I have seen adds on different pages where there is a cat on the bottom of the image and when you move your mouse over the image a ball moves with it and the cat moves his head back and forth following the ball. Or ones where a target follows the mouse and  you have to shout something.

My question is what language provides this real time mouse tracking, and what is it called?

I am trying to build this into a site.

Thanks for any info
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Here's a little something I've been playing with.

document.onmousemove= function (e){followMouse(e); }

function followMouse(e) {
var posx = 0;
var posy = 0;
if (!e) var e = window.event;
if (e.pageX || e.pageY) {
posx = e.pageX;
posy = e.pageY;
else if (e.clientX || e.clientY) {
posx = e.clientX + document.body.scrollLeft
+ document.documentElement.scrollLeft;
posy = e.clientY + document.body.scrollTop
+ document.documentElement.scrollTop;


function mark(x,y)
var d = document.getElementById('coords')
d.value=x+' x '+y;
d.style.top =parseInt(y+20)+'px';

<input type="text" id="coords" style="position:absolute;top:0px;left:0px;">
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