nav01 = new Image();
nav01.src="images/nav_01_ov.jpg";
nav02 = new Image();
nav02.src="images/nav_02_ov.jpg";
nav03 = new Image();
nav03.src="images/nav_03_ov.jpg";
nav04 = new Image();
nav04.src="images/nav_04_ov.jpg";
nav05 = new Image();
nav05.src="images/nav_05_ov.jpg";