How to vertically center an image?

I'd like to vertically center an image within a div.  I am using the HTML below but with no luck.  What am i doing wrong?
<div style="float:left; height:50%; margin-bottom:-250px;"></div>
            <div style="position:relative;left:20px;clear:both; height:500px;">
                <img alt="logo" src="images/logo.png" />
            </div>

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abemiesterAsked:
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JagarmTechnical Support AnalystCommented:
use:

      vertical-align:middle;
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abemiesterAuthor Commented:
That doesn't work either
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lharrispvCommented:
what about margin:0 auto; text-align:center; or perhaps the same but with a fixed width
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DaydreamsCommented:
Use the background-position property:

http://www.w3schools.com/css/pr_background-position.asp
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sscottiCommented:
Look at this and see if this helps:

http://www.dynamicsitesolutions.com/css/vertically-centering-with-line-height/

You should be able to center text, images and in-line elements using line-height.
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sscottiCommented:
BTW,  the DOCTYPE needs to be specified as:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> 

or

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

in order for line-height and vertical-align:middle to work.

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Nati4jcCommented:
i just put the image in a table and it works fine in FF, IE6, Opera and Safari:

<div style="float:left; height:50%; margin-bottom:-250px;"></div>
            <div id="div" style="position:relative;left:20px;clear:both; height:500px; background-color:#FF3300;">
             <table width="100%" height="100%" cellpadding="0" cellspacing="0"><tr><td valign="middle">   <img src="images/logo.png" alt="logo" name="image" id="image" />   </td></tr></table>         </div>
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DaydreamsCommented:
Hi abemiester, I'm glad my solution helped. I wonder why the B grade? If you needed any additional help I would have been happy to give you additional assistance.

About grading and the opportunity to answer your needs: http://www.experts-exchange.com/help.jsp?hi=403

You can change the grade by clicking the "request attention" button: http://www.experts-exchange.com/help.jsp?hi=404

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