var popover = null;
var hideTimer = null;
var timeout = 100;

$(function() {
    $("#topmenu ul li").mouseenter(function() {
        clearTimeout(hideTimer);
        $(".menuitem").hide(); // hide all menu items
        var id = $("a", this).attr("hash");
        popover = $(id);
        var y = $(this).position().left;
        if ($(this).hasClass("last")) {
            y -= 132;
        }
        $(popover).css("left", y);
        $(popover).fadeIn("fast");
    }).mouseleave(function() {
        // start timer
        hideTimer = setTimeout("hideMenu();", timeout);
    });
    $(".menuitem").mouseenter(function() {
        clearTimeout(hideTimer);
        
    }).mouseleave(function() {
        // start timer
        hideTimer = setTimeout("hideMenu();", timeout);
    });
});

function hideMenu() {
    if (popover) {
        $(popover).fadeOut();
    }
}