// Common Javascript Functions

// Image PreLoad and Rollover Functions

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) {
		home_over = newImage("/images/sitenav/home-over.jpg");
		forums_over = newImage("/images/sitenav/forums-over.gif");
		subscriptions_over = newImage("/images/sitenav/subscriptions-over.gif");
		pastissues_over = newImage("/images/sitenav/pastissues-over.gif");
		advertising_over = newImage("/images/sitenav/advertising-over.gif");
		viewissue2over = newImage("/images/viewissue-over.jpg");
		preloadFlag = true;
	}
}