jQuery.preloadImages = function() {
  for(var i = 0; i<arguments.length; i++) {
    jQuery("<img>").attr("src", arguments[i]);
  }
}

$j(document).ready(function() {
	$j.preloadImages(
		"../images/menus/header/facebook_icon.jpg",
		"../images/menus/header/facebook_icon-hover.jpg",
		"../images/menus/header/twitter_icon.jpg)",
		"../images/menus/header/twitter_icon-hover.jpg"
	);
});