How can I center with the div tag?

Hi, I want to center the right section on the top here that is next to the slideshow images on the left.  I defintely want the text, current edition, to be center to the space on the right.  How do I know how much space is left on the right side?  The total wideth is 800px.   How can I do that?  I tried the following div but it's not working.  Thank you.
http://keckmed.usc.edu/pp/


       <div style="width:350; margin: 0 auto;">
            <img alt="Keck Hospital" src="img/hospitals_header.jpg"/><br style="margin-top:20px"/><a href="http://www.usc.edu/hsc/info/pr/hospital_newsletter/index.html" style="font-size:14px; font-family:Arial, Helvetica, sans-serif; color:#900">Current Edition</a>
            <br/>
            <hr style="width:370px"/>
            <img alt="TheWeekly" style="margin-top: 22px" src="img/TheWeeklyCover-2011.jpg"/><br style="margin-top:10px"/><a href="http://theweekly.usc.edu/1vol17/www11.html" style="font-size:14px; font-family:Arial, Helvetica, sans-serif; color:#900">Current Edition</a>
      </div>                                                      <br/>
lapuccaAsked:
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QPRCommented:
To center a div on screen you need
margin-left: auto ;
margin-right: auto ;
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lapuccaAuthor Commented:
Thank you. I need those and this text-align:center and it's wroking now.  thank you.
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