var navOnmouseoverImages = new Array(5);
var navOnmouseoutImages = new Array(5);
var navImagesLoaded = false;

function loadNavImages () {
	for (var iNav = 0; iNav < 5; iNav++) {
		navOnmouseoutImages[iNav] = new Image();	navOnmouseoutImages[iNav].src = 'images/B' + (iNav+1) + '.gif';
		navOnmouseoverImages[iNav] = new Image();	navOnmouseoverImages[iNav].src = 'images/B' + (iNav+1) + '-o.gif';
	}
	navImagesLoaded = true;
}

function navOnmouseover (navImage, index) {
	if (navImagesLoaded)
		navImage.src = navOnmouseoverImages[index-1].src;
}

function navOnmouseout (navImage, index) {
	if (navImagesLoaded)
		navImage.src = navOnmouseoutImages[index-1].src;
}