gravatar avatar url generating helper method, simply pass an email to it

gistfile1.rb

def gravatar_url(email,options = {})
	require 'digest/md5'
	hash = Digest::MD5.hexdigest(email)
	url = "http://www.gravatar.com/avatar/#{hash}"
	options.each do |option|
		option == options.first ? url+="?" : url+="&"
		key = option[0].to_s
		value = option[1].to_s
		url+=key + "=" + value
	end
	url
end