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) {
		event_information_over = newImage("images/event_information_over.gif");
		workshop_over = newImage("images/workshop_over.gif");
		fcs_over = newImage("images/fcs_over.gif");
		beauty_salon_over = newImage("images/beauty_salon_over.gif");
		sd_customizing_contest_over = newImage("images/sd_customizing_contest_over.gif");
		customer_survey_over = newImage("images/customer_survey_over.gif");
		faq_over = newImage("images/faq_over.gif");
		how_to_apply_over = newImage("images/how_to_apply_over.gif");
		preloadFlag = true;
	}
}