Earthquake  

<!--  Paste this code into the HEAD of your HTML document -->

<SCRIPT LANGUAGE="JavaScript1.2">
<!-- Begin
function shake(n) {
if (parent.moveBy) {
for (i = 10; i > 0; i--) {
for (j = n; j > 0; j--) {
parent.moveBy(0,i);
parent.moveBy(i,0);
parent.moveBy(0,-i);
parent.moveBy(-i,0);
}
}
}
}
// End -->
</script>

<!-- Paste this code into the BODY of your web page -->

<center>
<form>
<input type=button onClick="shake(6)" value="Shake Screen">
</form>
</center>