/**
 * Creates a new image object in cache for the preloadImages() function below.
 */
function newImage (arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}
	
/**
 * Swaps the image named in the first argument with the one in the second.
 */
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];
		}
	}
}
	
/**
 * Preloads the horizontal navigation images onLoad of the page so that there is
 * no initial delay when the user rolls over them.
 */
var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		var btn_credit_off = 	newImage('img/btn_credit_off.gif');
		var btn_credit_on = 	newImage('img/btn_credit_on.gif');
		var btn_lai_off = 		newImage('img/btn_lai_off.gif');
		var btn_lai_on = 		newImage('img/btn_lai_on.gif');
		var btn_shi_off = 		newImage('img/btn_shi_off.gif');
		var btn_shi_on = 		newImage('img/btn_shi_on.gif');
		var btn_invest_off = 	newImage('img/btn_invest_off.gif');
		var btn_invest_on = 	newImage('img/btn_invest_on.gif');
		var btn_ai_off = 		newImage('img/btn_ai_off.gif');
		var btn_ai_on = 		newImage('img/btn_ai_on.gif');		
		var btn_msi_off = 		newImage('img/btn_msi_off.gif');
		var btn_msi_on = 		newImage('img/btn_msi_on.gif');			
		preloadFlag = true;
	}
}