// rollover on
function imgOn(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + '_on.src');
	}
}

// rollover off
function imgOff(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + '_off.src');
	}
}	

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


function changeImagesArray(array) {
	if (preloadFlag == true) {
		var d = document; var img;
		for (var i=0; i<array.length; i+=2) {
			img = null; var n = array[i];
			if (d.images) {img = d.images[n];}
			if (!img && d.getElementById) {img = d.getElementById(n);}
			if (img) {img.src = array[i+1];}
		}
	}
}


function changeImages() {
	changeImagesArray(changeImages.arguments);
}


var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pre_product_over = newImage('images/home/nav/product_over.jpg');
		pre_lifestyle_over = newImage('images/home/nav/lifestyle_over.jpg');
		pre_media_over = newImage('images/home/nav/media_over.jpg');
		pre_events_over = newImage('images/home/nav/events_over.jpg');
		pre_about_over = newImage('images/home/nav/about_over.jpg');
		pre_catalog_over = newImage('images/home/nav/catalog_hover.jpg');
		pre_contact_over = newImage('images/home/nav/contact_over.jpg');
		pre_cockpitjapanbtn_over = newImage('images/home/cockpitjapanbtn_over.gif');
		preloadFlag = true;
	}
}