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) {
			h_home_btn_over = newImage("images/h_home_btn-over.jpg");
			h_about_us_btn_over = newImage("images/h_about_us_btn-over.jpg");
			h_services_btn_over = newImage("images/h_services_btn-over.jpg");
			h_library_btn_over = newImage("images/h_library_btn-over.jpg");
			h_ecommunity_btn_over = newImage("images/h_ecommunity_btn-over.jpg");
			h_articles_btn_over = newImage("images/h_articles_btn-over.jpg");
			h_portfolio_btn_over = newImage("images/h_portfolio_btn-over.jpg");
			h_news_btn_over = newImage("images/h_news_btn-over.jpg");
			h_contact_btn_over = newImage("images/h_contact_btn-over.jpg");
			h_nccbtn_over = newImage("images/h_nccbtn-over.jpg");
			h_rmbtn_over = newImage("images/h_rmbtn-over.jpg");
			h_dcbtn_over = newImage("images/h_dcbtn-over.jpg");
			h_download_over = newImage("images/h_download-over.jpg");
			preloadFlag = true;
		}
	}
	
	window.onload = function() {
		preloadImages();
	}

	var auxWin;
	
	function auxwinOpen(url, w, h) {
		if (auxWin) auxWin.close();
		auxWin = window.open(url, "auxWindow", feature="resizable=no,scrollbars=yes,screenX=200,left=200,screenY=200,right=200,width=" + w + ",height=" + h);
		auxWin.focus();
	}