'now loading' for Rails3 & jQuery

	// Set passed background-image to form type=submit just before ajax request was submitted.
	// reset with ajax:complete.
	// options:
	// loadingImage: background-image
	// loadingText: text
	jQuery.fn.swapBackgroundToLoading = function(options){
	$(this).live('ajax:before', function(){
	var submit = $(this).find('input[type=submit]')
	var text = submit.val();
	var backgroundImage = submit.css('background-image');
	// set loading
	submit.val(options.loadingText || '');
	submit.css('background-image', 'url(' + loadingImagePath + ')');
	$(this).one('ajax:complete', function(){
	// reset
	submit.css('background-image', backgroundImage);
	submit.val(text);
	});
	});
	};

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