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) {
		roll_news1_over = newImage("images/roll_news1-over.gif");
		roll_calend1_over = newImage("images/roll_calend1-over.gif");
		roll_history_over = newImage("images/roll_history-over.gif");
		roll_club_over = newImage("images/roll_club-over.gif");
		roll_eq1_over = newImage("images/roll_eq1-over.gif");
		roll_find_over = newImage("images/roll_find-over.gif");
		roll_links1_over = newImage("images/roll_links1-over.gif");
		wind = newImage("img/wind_ind_1.gif");
		preloadFlag = true;
	}
}