How to put an image inside of a smaller div in the middle? [duplicate]

Question

Possible Duplicate:
Aligning image to center inside a smaller div

I have a problem which points to CSS 3. Please see the part of my HTML code:

<div id="main" style="width: 320px; height: 400px;">
   <img src="test.jpg" height="400" />
</div>

I don't know the real sizes of the test.jpg file (width can be different - the file is dynamic). I want to have the image in the middle of id="main" (I don't care, that the left & right part of the image will be out of range - it's even better). How can I do that ?

Answer 1

As long as you specify any width, you can center by adding margin:auto; . This isn't CSS3.

<img src="test.jpg" style="margin:auto; width:200px;display:block" />

Answer 2

this will do the work

<div id="main" style="width: 320px; height: 400px;background-position:center;background-repeat:no-repeat;background-image:url('test.jpg')">

</div>