img1a = new Image; 
img1b = new Image;
img1a.src = "images/nav/homes.gif"; 
img1b.src = "images/nav/homes_on.gif";
img2a = new Image; 
img2b = new Image;
img2a.src = "images/nav/features.gif"; 
img2b.src = "images/nav/features_on.gif";
img3a = new Image; 
img3b = new Image;
img3a.src = "images/nav/amenities.gif"; 
img3b.src = "images/nav/amenities_on.gif";
img4a = new Image; 
img4b = new Image;
img4a.src = "images/nav/location.gif";
img4b.src = "images/nav/location_on.gif";
img5a = new Image; 
img5b = new Image;
img5a.src = "images/nav/contact.gif";
img5b.src = "images/nav/contact_on.gif";
img6a = new Image; 
img6b = new Image;
img6a.src = "images/nav/builderstory.gif";
img6b.src = "images/nav/builderstory_on.gif";