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) {
		index_07_Orgin_over = newImage("images/index_07-Orgin_over.jpg");
		index_07_calendar_over = newImage("images/index_07-calendar_over.jpg");
		index_07_infosec_over = newImage("images/index_07-infosec_over.jpg");
		index_07_staff_over = newImage("images/index_07-staff_over.jpg");
		index_07_data_over = newImage("images/index_07-data_over.jpg");
		index_07_Dept_over = newImage("images/index_07-Dept_over.jpg");
		footer_Dept_over = newImage("images/footer-Dept_over.jpg");
		preloadFlag = true;
	}
}