\/blockquote\>\n<blockquote\>/g, '\n<br>' )
  mdstr = mdstr.replace(/<\/blockquote\>\n<br\><blockquote\>/g, '\n<br>' )
                
  // image syntax: ![title](url) => <img alt="title" src="url" />          
  mdstr = mdstr.replace(/!\[(.*?)\]\((.*?) "(.*?)"\)/gm, '<img alt="$1" src="$2" $3 />')
  mdstr = mdstr.replace(/!\[(.*?)\]\((.*?)\)/gm, '<img alt="$1" src="$2" width="90%" />')
                
  // links syntax: [title "title"](url) => <a href="url" title="title">text</a>          
  mdstr = mdst