var preloaded = new Array();

function preload_images() {
    for (var i = 0; i < arguments.length; i++){
        preloaded[i] = document.createElement('img');
        preloaded[i].setAttribute('src',arguments[i]);
    }
}

preload_images(
	'/images-nav/navtop-home-on.png',
	'/images-nav/navtop-jobs-on.png',
	'/images-nav/navtop-bene-on.png',
	'/images-nav/navtop-care-on.png',
	'/images-nav/navtop-cult-on.png',
	'/images-nav/navtop-dive-on.png',
	'/images-nav/navtop-faqs-on.png',
	'/images-nav/SpryMenuBarLeftHover.gif');