var topDoc = document;
//topDoc.plan.src = 'images/topi-plan-down.jpg';
//topDoc.about.src = 'images/topi-about-down.jpg';
//topDoc.service.src = 'images/topi-service-down.jpg';
//topDoc.location.src = 'images/topi-location-down.jpg';
//topDoc.news.src = 'images/topi-news-down.jpg';