mainPage = new Image;
mainPage.src = 'images/default/menu_top/menu_top_button_mainPage_hover.jpg';

netIT = new Image;
netIT.src = 'images/default/menu_top/menu_top_button_netIT_hover.jpg';

app = new Image;
app.src = 'images/default/menu_top/menu_top_button_app_hover.jpg';

conference = new Image;
conference.src = 'images/default/menu_top/menu_top_button_conference_hover.jpg';

offer = new Image;
offer.src = 'images/default/menu_top/menu_top_button_offer_hover.jpg';

contact = new Image;
contact.src = 'images/default/menu_top/menu_top_button_contact_hover.jpg';