TErrremoto con javascript no funciona ayuda

[yooom]

codigo de java con enlace a terremoto no funciona muestro

Código HTML:

<script language="javascript" type="text/javascript">
<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! [url]http://javascript.internet.com[/url] -->
function shake_xy(n) {
if (self.moveBy) {
for (i = 10; i > 0; i--) {
for (j = n; j > 0; j--) {
self.moveBy(0,i);
self.moveBy(i,0);
self.moveBy(0,-i);
self.moveBy(-i,0);
}
}
}
}
 
function shake_x(n) {
if (self.moveBy) {
for (i = 10; i > 0; i--) {
for (j = n; j > 0; j--) {
self.moveBy(i,0);
self.moveBy(-i,0);
}
}
}
}
 
function shake_y(n) {
if (self.moveBy) {
for (i = 10; i > 0; i--) {
for (j = n; j > 0; j--) {
self.moveBy(0,i);
self.moveBy(0,-i);
}
}
}
}
 
//--> 
</script>

<!--  y  e l en lace pude ser boton o <a>--->

 <a href="javascript:shake_xy(3)">Sacudir pantalla</a>  

o

 <input type=button value="Sacudir pantalla" onclick="shake_x(4)">