var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		btn_products_over = newImage("images/btn_products_over.gif");
		btn_freedemo_over = newImage("images/btn_freedemo_over.gif");
		btn_download_over = newImage("images/btn_download_over.gif");
		btn_order_over = newImage("images/btn_order_over.gif");
		btn_about_over = newImage("images/btn_about_over.gif");
		btn_home_over = newImage("images/btn_home_over.gif");
		btn_products_dgnpro8 = newImage("images/btn_products_dgnpro8_over.gif");
		btn_products_dgnpro = newImage("images/btn_products_dgnpro_over.gif");
		btn_products_dgn2dwg = newImage("images/btn_products_dgn2dwg_over.gif");
		btn_products_dgnviewer = newImage("images/btn_products_dgnviewer_over.gif");
		btn_products_compare = newImage("images/btn_products_compare_over.gif");
		btn_products_order = newImage("images/btn_products_order_over.gif");
		preloadFlag = true;
	}
}