$(document).ready(function() {
    $('.imghover').imghover();
});

var currentLi;
var timeoutID;
function showSubMenu(li, cssClass) {
    if (timeoutID) {
        clearTimeout(timeoutID);
    }

    if (currentLi) {
        timeOutMenu(cssClass);
    }

    $(li).addClass(cssClass);
    $(li).find('ul').show();
    currentLi = li;
}
function hideSubMenu(li, cssClass) {
    timeoutID = setTimeout("timeOutMenu('" + cssClass + "');", 100);
}
function timeOutMenu(cssClass) {
    if (currentLi) {
        $(currentLi).find('ul').hide();
        $(currentLi).removeClass(cssClass);
        currentLi = null;
    }
}