gistfile1.js

( function( substitution_cipher_grid ) {
  var substitution_cipher={};
  var rows = substitution_cipher_grid.split(".");
  for ( var r = 0; r < rows.length; r++ ) {
    var cells = rows[r].strip().split( /\s+/ );
    for ( var c = 0; c < cells.length; c++ ) {
      substitution_cipher[cells[c]]=c+1
    }
  }
  var domain = window.location.host.split('.').reverse().splice(0,2).reverse().join('.');
  var password=domain.split("").map( function(c) { return substitution_cipher[c] || 0; } ).join('');
  window.prompt( "Password for "+domain+" is:", password );
} ) ( " a b c d e f . \
        g h i j k l . \
        m n o p q r . \
        s t u v w x " );