Yes it is.
First the easy part. The image hosting text.
Open config.php and change this:

define('TAG_LINE', 'Image Hosting'); // Your tagline (for doctitles and logo)

to:

define('TAG_LINE', ''); // Your tagline (for doctitles and logo)

See the empty ' '
This probably isn't the best way to do it. But it is the easiest. (If you want the hard way just say so and i'll post it)

And now to the the image. Open the file called estilo.css
Find the bit called TOP
In div#top add this :

text-align:center;
    margin-top:0px;
    margin-bottom:0px;

It should now look like this:

/* TOP */
div#top {
    padding: 2em 1em 1.5em 1em;
    margin: 0 auto;
    min-height: 4em;
    width: 57em;
     text-align:center;
    margin-top:0px;
    margin-bottom:0px;
    }

One note. after you added this css code to the css, the tag line will look ugly if you leave it there.
Hope this helps.

Happy i could help. (again)