Highlighting current page

Hi there

Working on current page highlights. The below works for the last two
li’s, but not the first one. It’s my ‘posts’ page, so I guess the ‘is_page’ bit needs changing, but how?

<ul id="menuenu"> 

<li class="page_item <?php if (is_page('235')) { echo "current_page_item"; }?>">
<a href="http://mydomain.co.uk/">Blog</a></li> 

<li class="page_item <?php if (is_category('61')) { echo "current_page_item"; }?>">
<a href="http://mydomain.co.uk/archives/category/portfolio">Work</a></li>

<li class="page_item <?php if (is_page('2')) { echo "current_page_item"; }?>">
<a href="http://mydomain.co.uk/about">About</a></li>

</ul>