code: function(lineIndex, lineNumber, code)
          {
              var classes = [
                  'line',
                  'number' + lineNumber,
                  'index' + lineIndex,
                  'alt' + (lineNumber % 2 == 0 ? 1 : 2).toString()
              ];
  
              if (this.isLineHighlighted(lineNumber))
                  classes.push('highlighted');
  
              if (lineNumber == 0)
                  classes.push('break');
  
              return '<div class="' + classes.join(' ') + '">' + code + '</div>';
          }
docs: Generates HTML markup for a single line of code while determining alternating line style.
  @param {Integer} lineNumber	Line number.
  @param {String} code Line	HTML markup.
  @return {String}				Returns HTML markup.