var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pre_columns1 = newImage('images/columns1.gif');
		pre_warranties1 = newImage('images/warranties1.gif');
		pre_installation1 = newImage('images/installation1.gif');
		pre_cads1 = newImage('images/cads1.gif');
		pre_catalog_request1 = newImage('images/catalog_request1.gif');
		pre_about1 = newImage('images/about1.gif');
		pre_gallery1 = newImage('images/gallery1.gif');
		preloadFlag = true;
	}
}