function newImage(arg) {if (document.images) {rslt = new Image(); rslt.src = arg; return rslt;}}

function changeImages() {
	//alert('hi');
	if (document.images){
		for (var i=0; i<changeImages.arguments.length; i+=2){
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

//instantiate all nav images
newImage('/images/about.gif');
newImage('/images/services.gif');
newImage('/images/newsletter.gif');
newImage('/images/contact.gif');