In order to use a transparent image or logo (that is, an image that doesn't have a background), you must use a png file.
"Portable Network Graphics (PNG) is a raster graphics file format that supports lossless data compression." Wikipedia
Your designer should be able to provide a high quality png file for print use to upload into your library.
**Menu Services On Demand suggests Lunapic for a quick way to make your logo transparent. Follow this link: