Reload image on failure with exponential backoff

gistfile1.js

$("img.thumb").error(function() {		
	var path = $(this).data('src');
	var img = $(this);

	// Put back mock image
	$(img).attr('src', 'http://placehold.it/56x56');

	// Increment loading counter
	var attempt = ($(img).data('attempt') || 0);
	attempt++;
	$(img).data('attempt', attempt);

	// Get reload time in seconds with exponential backoff (between 1 and 120 seconds)
	var time = Math.min(120, Math.round(Math.exp(attempt/5)));

	// Reschedule a loading attempt
	setTimeout(function() {
		$(img).attr('src', path);
	}, time*1000);
});