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How can i adjust the look of the Widget?

Picasaedissimo uses some basic inline styles to make it work right out of the box. However it can be easily adjusted through your CSS stylesheet. Use the CSS-Class "picasaedissimo_image" to adjust the image appearance, and the "picasaedissimo" ID to adjust the ul and li tags. e.g.

.picasaedissimo_image {
  width: 14em !important;
  padding: 1px;
  border: solid 4px #fff;
}
#picasaedissimo ul li {text-align:center;}

Notice the !important to override the inline width of the picasaedissimo_image class.

My Widget does not show any images! What's wrong?

Most likely the url you supplied contains an error or does not point to an valid Picasa Album feed. Make sure the url points to a valid Picasa ALBUM feed and NOT to the Picasa account feed showing your albums.

How can I avoid the image filenames beeing displayed while the images are loading?

This can not be avoided. What you are seeing is the alternate text of the image for people not wanting or beeing able to see images. You can, however, supply a caption for each image in Picasa. When a caption is found, Picasaedissimo will use that as the alternate text instead of the filename.