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) {

		topnav1 = newImage("/images/iib_v6b_nav_01_over.gif");
		topnav2 = newImage("/images/iib_v6b_nav_02_over.gif");
		topnav3 = newImage("/images/iib_v6b_nav_03_over.gif");
		topnav4 = newImage("/images/iib_v6b_nav_04_over.gif");
		topnav5 = newImage("/images/iib_v6b_nav_05_over.gif");
		topnav6 = newImage("/images/iib_v6b_nav_06_over.gif");
		topnav7 = newImage("/images/iib_v6b_nav_07_over.gif");
		preloadFlag = true;
	}
}