Page numbers with "Page"

[address@hidden]

I want to put page numbers centered at the bottom of each page with the word 
"Page" before the number.  I found this code in the docs which gets me halfway 
there but I don't know what to do to add "Page" before each number.  The 
closest I've managed to come to a solution results in "Page" being in the lower 
left corner with the page number in the lower right corner.

-David

\version "2.18.2"

\book {
  \paper {
    print-page-number = ##t
    print-first-page-number = ##t
    oddHeaderMarkup = \markup \null
    evenHeaderMarkup = \markup \null
    oddFooterMarkup = \markup {
      \fill-line { 
        \on-the-fly \print-page-number-check-first 
        \fromproperty #'page:page-number-string 
      }
    }
    evenFooterMarkup = \oddFooterMarkup
  }
  \score {
    \new Staff { s1 \break s1 \break s1 }
  }
}