verazub,
вариант ...
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
#side_bar_inner li:nth-of-type(2) .left_row:before {
font-size: 13px !important;
content:"Test3";
}
#side_bar_inner li:nth-of-type(3) .left_row:before {
font-size: 13px !important;
content:"Test4";
}
#side_bar_inner li:nth-of-type(2) .left_label{
visibility: hidden;
}
#side_bar_inner li:nth-of-type(3) .left_label{
visibility: hidden;
}
</style>
</head>
<body>
<div id="side_bar_inner">
<ol>
<li id="l_pr">
<a href="/primer">
<span class="left_label inl_bl">Моя страница</span>
</a>
</li>
<li id="l_mgid11111111">
<a href="/test1" class="left_row">
<span class="left_label inl_bl">test1</span>
</a>
</li>
<li id="l_mgid22222222">
<a href="/test2" class="left_row">
<span class="left_label inl_bl">test2</span>
</a>
</li>
</ol>
</div>
</body>
</html>