Check if mouse is over a div

Check if mouse is over a div

how do i check that mouse is over a div. For Example
$(document).ready(function (){ 
$(".setting").click(function(){$("#dropDown").slideDown("normal");});
                $(".setting").mouseleave(function(){ 
                         if($("#dropDown").mouseover()==false)
                          {
                           $("#dropDown).slideUp("slow");
                           }});
                           });
how do i check ($("#dropDown").mouseover()==false)