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center "float left" elements on screen?

I have three equally sized DIVs on my screen, floating left so they are next to each other. How is it possible to center these three items? Here is my page:

http://www.sterlingmodular.com/v2/racking-systems.asp

This seems like it should be simple to do. Relevant portions of my CSS and HTML are attached. Thank you!
div.planseriesbox {
		margin: 0px;
		padding: 0px 10px 10px 0px;
		width: 169px;
		height: 145px;
		float: left;
	}

<div class="planseriesbox">
	<a href="racking-systems-one-bay.asp">
	<div class="planseriescontainer"><img src="art/ph_racking-systems2.jpg" width="169" height="145" border="0" />
		<p class="planseries"><span class="blue">One Bay Racks &gt;</span></p>
	</div>
	</a>
</div>

<div class="planseriesbox">
	<a href="racking-systems-two-bay.asp">
	<div class="planseriescontainer"><img src="art/ph_racking-systems1.jpg" width="169" height="145" border="0" />
		<p class="planseries"><span class="blue">Two Bay Racks &gt;</span></p>
	</div>
	</a>
</div>

<div class="planseriesbox">
	<a href="racking-systems-face-up.asp">
	<div class="planseriescontainer"><img src="art/ph_racking-systems3.jpg" width="169" height="145" border="0" />
		<p class="planseries"><span class="blue">"Face-Up" Rack &gt;</span></p>
	</div>
	</a>
</div>

<div class="clear"></div>

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bbdesign
Asked:
bbdesign
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1 Solution
 
LZ1Commented:
The best way is to wrap all of those in a div that's just wide enough to hold all 3 and then give that a margin:0px auto.

So something like this:

<div id="center-wrap" style="margin:0px auto;width:600px;">
<div class="planseriesbox"> content </div>
<div class="planseriesbox"> content </div>
<div class="planseriesbox"> content </div>
</div><!--end center-wrap-->

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bbdesignAuthor Commented:
OK, that works:

div.center {
            margin: 0px auto;
            width: 537px;
      }

http://www.sterlingmodular.com/v2/racking-systems.asp

However, it seems I have to specify the exact width of the DIV in order to get it exactly centered? So I can't reuse this class elsewhere in the site unless the contents are also exactly 537px wide? It would be nice if there could be a generic centering DIV that I could reuse. But perhaps not possible?
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LZ1Commented:
This is a very simplistic solution based on your issue.  To be able to do something custom like that over and over, you may have to use percentages and I'm not sure it would work correctly.  Generally when centering a div on a page we use an exact width and margin:0 auto.  Even if you were to use a percentage, it would be difficult to get it right every time because of the varying widths.
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bbdesignAuthor Commented:
That's what I kind of figured. Thanks for the info!
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