I have a small image on 6x6 pixels that I would like to use

Hi! I have a small image on 6x6 pixels that I would like to use as a border, as seen here:

http://imgur.com/ieLbw6u

This is my CSS code for the sidebar:

#sidebar{
background-color: #fff;
height: 550px;
border-image: url('http://stilius.se/wilink/wp-content/uploads/2013/04/border.png') repeat;
border-width: 6;
}

The result can be found at stilius.se/wilink.

The problem is, this image only shows up once in the corners, and does not repeat. I would like to have it all the way round. How would I do this?