// JavaScript Document
	// create preloaded images
	function newImage(arg) {
	     if (document.images) {
	          rslt = new Image();
	          rslt.src = arg;
	          return rslt;
	     }
	}
	
	// define preloaded images
	var preloadFlag = false;
	function preloadImages() {
	     if (document.images) {
			// primary nav images
			shopping_over = newImage("images/navigation/shopping_over.gif");
			visitors_over = newImage("images/navigation/nav_visitors_over.gif");
			news_over = newImage("images/navigation/nav_news_over.gif");
			history_over = newImage("images/navigation/nav_history_over.gif");
			private_over = newImage("images/navigation/nav_private_over.gif");
			about_over = newImage("images/navigation/nav_about_over.gif");
			
			preloadFlag = true;
		}
	}
	
	// image swapping function
	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];
	          }
	     }
	}