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() {
	if (document.images) {
		img_arrows_01_down = newImage("images/img_arrows_01_down.gif");
		img_arrows_02_down = newImage("images/img_arrows_02_down.gif");
		nhyc_navgen_02_over = newImage("images/nhyc_navgen_02_over.gif");
		nhyc_navgen_02_click = newImage("images/nhyc_navgen_02_click.gif");
		nhyc_navgen_04_over = newImage("images/nhyc_navgen_04_over.gif");
		nhyc_navgen_04_click = newImage("images/nhyc_navgen_04_click.gif");
		nhyc_navgen_06_over = newImage("images/nhyc_navgen_06_over.gif");
		nhyc_navgen_06_click = newImage("images/nhyc_navgen_06_click.gif");
		nhyc_navgen_08_over = newImage("images/nhyc_navgen_08_over.gif");
		nhyc_navgen_08_click = newImage("images/nhyc_navgen_08_click.gif");
		nhyc_navgen_10_over = newImage("images/nhyc_navgen_10_over.gif");
		nhyc_navgen_10_click = newImage("images/nhyc_navgen_10_click.gif");
		nhyc_navgen_12_over = newImage("images/nhyc_navgen_12_over.gif");
		nhyc_navgen_12_click = newImage("images/nhyc_navgen_12_click.gif");
		preloadFlag = true;
	}
}

function doPreload() {
   var the_images = new Array('/images/nav_about_us.gif', '/images/nav_about_us_over.gif', '/images/nav_what_we_do.gif',
	   '/images/nav_what_we_do_over.gif', '/images/nav_portfolio.gif', '/images/nav_portfolio_over.gif', '/images/nav_our_clients.gif',
	   '/images/nav_our_clients_over.gif', '/images/nav_contact_us.gif', '/images/nav_contact_us_over.gif', '/images/nav_home.gif', 
	   '/images/nav_home_over.gif', '/images/nav_home_sel.gif', '/images/nav_home_over_sel.gif', '/images/nav_left_end.gif', 
	   '/images/nav_right_end.gif', '/images/nav_bg.gif', '/images/quickpane_corner_topleft.gif', '/images/quickpane_bgtop.gif',
	   '/images/quickpane_corner_topright.gif', '/images/quickpane_bgleft.gif', '/images/quickpane_bgvertline.gif',
	   'images/quickpane_bgright.gif', '/images/quickpane_corner_bottomleft.gif', '/images/quickpane_bgbottom.gif',
	   '/images/quickpane_corner_bottomright.gif' );
   newPreload(the_images);
}

function newPreload(the_images_array) {
	if (document.images) {
	   for( var loop = 0; loop < the_images_array.length; loop++) {
			var an_image = new Image();
			an_image.src = the_images_array[loop];
	   }
   		preloadFlag = true;
	}
}