Bronius,
Facebook is automatically selected the image it thinks best represents your page. Unfortunately, it's choosing the following:
alietuvis.us/images/banners/Saulius%20Modestas.gif
That is an animated GIF, which Facebook does not display. So, you're just seeing the first frame, which is a solid blue image.
Please either set a default image in the Open Graph area of JFBConnect by adding the following line:
image=http://site.com/link-to-default.jpg
That image will be detected by Facebook and used automatically after about a week. On individual pages, you can set a specific image for that page by adding the following tag:
{JFBCGraph image=http://site.com/link-to-better-image.jpg}
Hope that helps,
Alex