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) {

			home_over = newImage("images/home_over.gif");

			services_over = newImage("images/services_over.gif");

			clients_over = newImage("images/clients_over.gif");

			presentations_over = newImage("images/presentations_over.gif");

			publications_over = newImage("images/publications_over.gif");

			roles_over = newImage("images/roles_over.gif");

			news_over = newImage("images/news_over.gif");

			preloadFlag = true;

		}

	}