//////////////////////////////////////
// rollover.js
//////////////////////////////////////
// Copyright 2005 Christopher Gronbeck
// christopher@susdesign.com
//////////////////////////////////////

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages(root_dir) {
	if (document.images) {
		sbd_over = newImage(root_dir + "/nav_images/sbd-over.gif");
		sbd_down = newImage(root_dir + "/nav_images/sbd-down.gif");
		copyright_copyright_over = newImage(root_dir + "/nav_images/copyright_copyright-over.gif");
		copyright_copyright_down = newImage(root_dir + "/nav_images/copyright_copyright-down.gif");
		menu_tools_over = newImage(root_dir + "/nav_images/menu_tools-over.gif");
		menu_tools_down = newImage(root_dir + "/nav_images/menu_tools-down.gif");
		menu_consulting_over = newImage(root_dir + "/nav_images/menu_consulting-over.gif");
		menu_consulting_down = newImage(root_dir + "/nav_images/menu_consulting-down.gif");
		menu_about_over = newImage(root_dir + "/nav_images/menu_about-over.gif");
		menu_about_down = newImage(root_dir + "/nav_images/menu_about-down.gif");
		menu_contact_over = newImage(root_dir + "/nav_images/menu_contact-over.gif");
		menu_contact_down = newImage(root_dir + "/nav_images/menu_contact-down.gif");
		menu_solar_over = newImage(root_dir + "/nav_images/menu_solar_cooking-over.gif");
		menu_solar_down = newImage(root_dir + "/nav_images/menu_solar_cooking-down.gif");
		preloadFlag = true;
	}
}