<div id="img" style="width:200px; height:200px; position:absolute; left:50px; top:50px; z-index:1;">
<a href="http://www.여기에원하는주소"><img src="bird.gif" border="0" onMouseover="pauseResume();" onMouseout="pauseResume();"></a>
</div>

<scRIPT LANGUAGE="Javascript">
<!-- Original:  Justin Arruda (JArruda@mindspring.com) -->

<!-- This script and many more are available free online at -->
<!-- The Javascript Source!! http://javascript.internet.com -->

<!-- Begin
var step = 1;    //높을수록 빠릅니다.
var delay = 50;  //delay입니다. 놓을수록 느리고 낮을수록 빠릅니다.
var height = 0;
var Hoffset = 0;
var Woffset = 0;
var yon = 0;
var xon = 0;
var pause = true;
var interval;
var name = navigator.appName;
if(name == "Microsoft Internet Explorer") name = true;
else name = false;
var xPos = 20;
if(name) var yPos = document.body.clientHeight;
else var yPos = window.innerHeight;
function changePos() {
if(name) {
width = document.body.clientWidth;
height = document.body.clientHeight;
Hoffset = img.offsetHeight;
Woffset = img.offsetWidth;
img.style.left = xPos + document.body.scrollLeft;
img.style.top = yPos + document.body.scrollTop;
}
else {
height = window.innerHeight;
width = window.innerWidth;
Hoffset = document.img.clip.height;
Woffset = document.img.clip.width;
document.img.pageY = yPos + window.pageYOffset;
document.img.pageX = xPos + window.pageXOffset;
}
if (yon) {
yPos = yPos + step;
}
else {
yPos = yPos - step;
}
if (yPos < 0) {
yon = 1;
yPos = 0;
}
if (yPos >= (height - Hoffset)) {
yon = 0;
yPos = (height - Hoffset);
}
if (xon) {
xPos = xPos + step;
}
else {
xPos = xPos - step;
}
if (xPos < 0) {
xon = 1;
xPos = 0;
}
if (xPos >= (width - Woffset)) {
xon = 0;
xPos = (width - Woffset);
  }
}
function start() {
if(name) img.visibility = "visible";
else document.img.visibility = "visible";
interval = setInterval('changePos()',delay);
}
function pauseResume() {
if(pause) {
clearInterval(interval);
pause = false;
}
else {
interval = setInterval('changePos()',delay);
pause = true;
  }
}
start();
//  End -->
</script>

바디 안에다가 넣으면 됩니다 ^^