$(document).ready(function()
    {
        $('#menu-item-about-us').mouseover(function()
        {
            $('#dropdown-about-us').show();
        }).mouseout(function(){
            $('#dropdown-about-us').hide();
        });

         $('#menu-item-who-we-work-with').mouseover(function()
        {
            $('#dropdown-who-we-work-with').show();
        }).mouseout(function(){
            $('#dropdown-who-we-work-with').hide();
        });
    });