function NewImage() {
	return new Image();
};

$(document).ready(function() {
	var img_types = ['over', 'down'];
	var img_items = ['home', 'products', 'gallery', 'about', 'contacts'];
	for (t in img_types)
		{
		for (i in img_items)
			{
				NewImage().src = 'gfx/'+img_items[i]+'_'+img_types[t]+'.png'; 
			};
		};
});