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]);
    };
};

// home company services advantage news contact
preload_images(
    'templates/site/images/nv_homeon.gif',
    'templates/site/images/nv_companyon.gif',
    'templates/site/images/nv_serviceson.gif',
    'templates/site/images/nv_advantageon.gif',
    'templates/site/images/nv_newson.gif',
    'templates/site/images/nv_contactuson.gif'
);