How do I center text or image on fixed size of div using css

I have a div with fixed height & width. In the div have image with unknown height & width. How do I center the image.

Example http://jsfiddle.net/huhu/UyBNh/

I want the output to be like http://i.stack.imgur开发者_如何学JAVA.com/8x9qH.gif

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One option would be to use CSS. You can style it inline (if you are outputting from the DB sometimes this is the best way). Or assign it to a class. Either way:

background:url(http://i.stack.imgur.com/TW66h.png) 50% 50% no-repeat;

http://jsfiddle.net/VTgWg/1/

Here's a demo showing different size images: http://jsfiddle.net/r2wm2/1/

I've seen cases like this where you want to link the image. Here's an example of exchanging the div for an <a> tag: http://jsfiddle.net/zSuzm/1/

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#center {
    display:table-cell; 
    width:400px; 
    height:400px; 
    border:1px solid #444; 
    margin:auto;
    vertical-align:middle; 
    text-align:center}

This sets your div to be treated like a table cell, which has excellent support for centering. You don't need any CSS for the image.

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This css works on your example:

#center {width:400px; height:400px; border:1px solid #444; margin:auto; display: table-cell; vertical-align: middle;}
#center img { margin:auto; display:block;}

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You'll want to update the #center img section:

#center img {
    position: relative;
    left: 148px;
    top: 148px;
}

The center of the container would be 200px. Offsetting the image by 52px puts the center of the image on the center of the container.