//header image array code
		headerimages = new Array(6);
		headerimages[0] = "images/gr_array1.jpg";
		headerimages[1] = "images/gr_array2.jpg";
		headerimages[2] = "images/gr_array3.jpg";
		headerimages[3] = "images/gr_array4.jpg";
		headerimages[4] = "images/gr_array5.jpg";
		headerimages[5] = "images/gr_array6.jpg";
		imageindex = Math.floor(Math.random() * headerimages.length);
		
		//preload rollover code (quick and easy method)
		RO1 = new Image();
		RO1.src = "images/bt_demo_ro.gif";
		RO2 = new Image();
		RO2.src = "images/bt_catalog_ro.gif";
		RO3 = new Image();
		RO3.src = "images/bt_learning_ro.gif";
		RO4 = new Image();
		RO4.src = "images/bt_faq_ro.gif";
		RO5 = new Image();
		RO5.src = "images/bt_about_ro.gif";
		RO6 = new Image();
		RO6.src = "images/bt_solutions_ro.gif";
		RO7 = new Image();
		RO7.src = "images/bt_contact_ro.gif";
		RO8 = new Image();
		RO8.src = "images/bt_home_ro.gif";
		
		function LoadImg() {
			document.images.headerimg.src = headerimages[imageindex];
			return false;
		}