image1 = new Image(); 
image1.src="./_img/knap_active.gif"; 
image2 = new Image(); 
image2.src="./_img/menu_top.gif"; 
image3 = new Image(); 
image3.src="./_img/menu_midt.gif"; 
image4 = new Image(); 
image4.src="./_img/menu_bund.gif";