function preloader() {
	if (document.images) {
	//sub navigation
	nav_reg_r = newImage("/images/register/nav_reg_r.gif");
	nav_schedule_r = newImage("/images/register/nav_schedule_r.gif");
	nav_builder_r = newImage("/images/register/nav_builder_r.gif");
	nav_catalog_r = newImage("/images/register/nav_catalog_r.gif");

	preloadFlag = true
	}
}