if (document.images) {
				img1 = new Image
				img2 = new Image
				img3 = new Image
				img4 = new Image
				img5 = new Image
				nav_off = new Image
				
				nav_off1 = new Image
				nav_off2 = new Image
				nav_off3 = new Image
				nav_off4 = new Image
				nav_off5 = new Image
				 
				img1.src = "images/nav_materials_on.gif"
				img2.src = "images/nav_design_on.gif"
				img3.src = "images/nav_quality_on.gif"
				img4.src = "images/nav_contact_on.gif"
				img5.src = "images/nav_home_on.gif"
				
				nav_off.src = "images/nav_off.gif"
				nav_off1.src = "images/nav_materials_on.gif"
				nav_off2.src = "images/nav_design_on.gif"
				nav_off3.src = "images/nav_quality_on.gif"
				nav_off4.src = "images/nav_contact_on.gif"
				nav_off5.src = "images/nav_home_on.gif"
			}