//Variables
that = null;

//Do Stuff When DOM Is Ready
$(document).ready(function() {
    menuActions();
});

//Assign Menu Actions
function menuActions() {
    $('.Sitemap .Navigation ul li').mouseover(function() { if (that != this && that != null) { $(that).removeClass('showsub'); } that = this; $(this).addClass('showsub'); });
    $('#TableRow_Main').mouseover(function() { $(that).removeClass('showsub'); });   
}