Find part of string

HTML

Current situation:<br>
---------------------
<div id="container">

</div>  


Should look like:<br>
---------------------
<div id="container2">
  <b>1. Line:</b> Lorem ipsum<br><b>Another line:</b> dolor sit<br>Here is nothing to see<br><br><b>Last new line:</b> amed
</div>

CSS

#container { margin-bottom: 30px; }

#container2 b { background-color: yellow; }

JavaScript

$("#container").html('1. Line: Lorem ipsum<br>Another line: dolor sit<br>Here is nothing to see<br><br>Last new line: amed');
$("#container").css("font-weight","bold")