var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		over_news = newImage('graphics/tabs/news-over.gif');
		down_news = newImage('graphics/tabs/news-down.gif');
		over_activities = newImage('graphics/tabs/activities-over.gif');
		down_activities = newImage('graphics/tabs/activities-down.gif');
		over_resources = newImage('graphics/tabs/resources-over.gif');
		down_resources = newImage('graphics/tabs/resources-down.gif');
		over_contacts = newImage('graphics/tabs/contacts-over.gif');
		down_contacts = newImage('graphics/tabs/contacts-down.gif');
		over_about = newImage('graphics/tabs/about-over.gif');
		down_about = newImage('graphics/tabs/about-down.gif');
		preloadFlag = true;
	}
}