 inline code-block: `code-block` => <code>code-block</code>    
  mdstr = mdstr.replace(/``(.*?)``/gm, function(m,p){ return '<code>' + md.formatTag(p).replace(/`/g,'&#96;') + '</code>'} ) 
  mdstr = mdstr.replace(/`(.*?)`/gm, '<code>$1</code>' )
      
  // blockquote, max 2 levels => <blockquote>{text}</blockquote>
  mdstr = mdstr.replace(/^\>\> (.*$)/gm, '<blockquote><blockquote>$1</blockquote></blockquote>')
  mdstr = mdstr.replace(/^\> (.*$)/gm, '<blockquote>$1</blockquote>')
  mdstr = mdstr.replace(/<