nav_home = new Image();
nav_home.src = "images/nav_home_on.gif";

nav_how = new Image();
nav_how.src = "images/nav_how_on.gif";

nav_buy = new Image();
nav_buy.src = "images/nav_buy_on.gif";

nav_support = new Image();
nav_support.src = "images/nav_support_on.gif";

nav_tell = new Image();
nav_tell.src = "images/nav_tell_on.gif";

nav_contact = new Image();
nav_contact.src = "images/nav_contact_on.gif";

feature_course = new Image();
feature_course.src = "images/feature_course_on.gif";

feature_seminar = new Image();
feature_seminar.src = "images/feature_seminar_on.gif";

button_buy = new Image();
button_buy.src = "images/button_buy_on.gif";