var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pre_nav_disclaimer_on = newImage('images/nav_disclaimer_on.jpg');
		pre_nav_researchdevelopment_on = newImage('images/nav_researchdevelopment_on.jpg');
		pre_nav_products_on = newImage('images/nav_products_on.jpg');
		pre_nav_profile_on = newImage('images/nav_profile_on.jpg');
		pre_nav_contact_on = newImage('images/nav_contact_on.jpg');
		pre_nav_facilities_on = newImage('images/nav_facilities_on.jpg');
		pre_nav_home_on = newImage('images/nav_home_on.jpg');
		preloadFlag = true;
	}
}