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) {
				sidemenu_03_over = newImage("images/sidemenu_03-over.gif");
				sidemenu_04_over = newImage("images/sidemenu_04-over.gif");
				sidemenu_05_over = newImage("images/sidemenu_05-over.gif");
				sidemenu_06_over = newImage("images/sidemenu_06-over.gif");
				sidemenu_08_sidemenu_03_over = newImage("images/sidemenu_08-sidemenu_03_ove.gif");
				sidemenu_08_sidemenu_04_over = newImage("images/sidemenu_08-sidemenu_04_ove.gif");
				sidemenu_08_sidemenu_05_over = newImage("images/sidemenu_08-sidemenu_05_ove.gif");
				sidemenu_08_sidemenu_06_over = newImage("images/sidemenu_08-sidemenu_06_ove.gif");
				headmenu1_over = newImage("images/headmenu1-over.gif");
				headmenu2_over = newImage("images/headmenu2-over.gif");
				headmenu3_over = newImage("images/headmenu3-over.gif");
				headmenu4_over = newImage("images/headmenu4-over.gif");
				preloadFlag = true;
			}
		}