does "top" work on table elements with navigator?

Hey, i’m trying to position a table down with CSS using the top attribute. It works fine with IE but not with navigator. Can someone tell me why..

#center {
position: relative;
top: 20%;
}
<div align=”center” id=”center”>
<table width=”481″ height=”385″ border=”0″ cellspacing=”4″>
…
</table>

Also in #CSS _↴