I have 20 `<img>`-tags:

```
<img src="/image/1.jpg"/>
<img src="/image/2.jpg"/>
<img src="/image/3.jpg"/>
<img src="/image/....jpg"/>
<img src="/image/N.jpg"/>

```

How can I order these pictures in a block layout of 4 images per row?
Only valid `div`, no table!

Example: <http://new.music.yahoo.com/videos/charts/>