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) {
		nav_photographs_over = newImage("../images/nav_photographs_over.gif");
		nav_news_over = newImage("../images/nav_news_over.gif");
		nav_press_over = newImage("../images/nav_press_over.gif");
		nav_about_over = newImage("../images/nav_about_over.gif");
		nav_blog_over = newImage("../images/nav_blog_over.gif");
		nav_contact_over = newImage("../images/nav_contact_over.gif");
		arrow_left_over = newImage("../images/arrow_left_over.gif");
		arrow_right_over = newImage("../images/arrow_right_over.gif");
		grid_over = newImage("../images/grid_over.gif");
		preloadFlag = true;
	}
}