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 doPreload() {
   var the_images = new Array('nav_about_us.jpg','nav_about_us_over.jpg','nav_acquisitions.jpg','nav_acquisitions_over.jpg','nav_client.jpg',
							  'nav_client_over.jpg','nav_contact.jpg','nav_contact_over.jpg','nav_news.jpg','nav_news_over.jpg','nav_portfolio.jpg',
							  'nav_portfolio_over.jpg','nav_vert_line1.jpg','nav_vert_line_over_right.jpg','nav_vert_line_over_left.jpg',
							  'nav_vert_line2.jpg','nav_vert_line2_over_left.jpg','nav_vert_line2_over_right.jpg','nav_vert_line3.jpg',
							  'nav_vert_line3_over_left.jpg','nav_vert_line3_over_right.jpg','nav_vert_line4.jpg','nav_vert_line4_over_left.jpg',
							  'nav_vert_line4_over_right.jpg','nav_vert_line5.jpg','nav_vert_line5_over_left.jpg','nav_vert_line5_over_right.jpg',
							  'nav_vert_line6.jpg','nav_vert_line6_over_left.jpg','nav_vert_line6_over_right.jpg');
   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 = '/images/' + the_images_array[loop];
	   }
   		preloadFlag = true;
	}
}