<ul id="menu1">
<li>Home</li>
<li>About</li>
<li>Products</li>
<li>Services</li>
<li>Stuff</li>
<li>Contact</li>
</ul>
<ul id="menu2"></ul>
<script>
$('#menu1 li').each(function(index, elem){
var myposition = $(elem).position();
var mytop = myposition.top;
// do the math
var hide = (mytop > 0);
if(hide){
// move to menu2
menu2array.push($(elem));
}else{
// remove from menu 2