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pools = {1 => [1,2,3], 2=> [3,4,5], 3=> [5,6,7]}

pools.inject([]) {|m,x| m << x[1].select {|y| pools[x[0] + 1].include?(y) unless pools[x[0] + 1].nil?}}.flatten
...

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<style type="text/css">
  a.go_back { background: url(/images/go_back.png) center left no-repeat; padding-left: /*width of go_back.png*/;}
</style>
...

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<%= link_to "#{image_tag("go_back.png")}Go Back", user_path(@user) %>

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require 'rubygems'
require 'functor'

...