$(document).ready(function(){
    $(".categoriesMenu").delegate("li:not(a:has([class=selectedLink]))", "mouseover", function(e){
        var self = $(this);
        self.siblings(".open").children("ul").slideUp("medium", function(){
            $(this).parent().removeClass("open");
        });
        self.addClass("open")
        .children("ul").slideDown("medium");
    })

});