if(document.images)
{img1=new Image();img2=new Image();img3=new Image();img4=new Image();img5=new Image();img1.src="graphics/northwest_fire_systems.png";img2.src="graphics/menu.png";img3.src="graphics/menu_hover.png";img4.src="graphics/topbackground.jpg";img5.src="graphics/footer3.png";}