U.Helper

vertical-align:middle

<div id="block">
<img src="" alt="" /><br />
<span style="text-align:center;">Some text</span>
</div>

<style type="text/css">
#block
{
  padding-left:20px;
  background:url("...") no-repeat scroll transparent;
  vertical-align:middle;
}
</style>

<div id="block">Blah Blah Blah</div>

<style type="text/css">
#block
{
line-height:24px;
}

#imgx
{
border:none;
width:16px;
vertical-align:middle;
}
</style>

<div id="block"><img alt="" src="http://helper.ucoz.ru/images/groups/system.png" id="imgx" /> Some text</div>