Hi,
I just found a nice and easy to install solar powered fountain on EBay,
that must just be placed into the water, that is all.
The only disadvantage might be, that the water is sprinkling just
onto the solar base all the time and not much into the water,
so the sound might not be as nice as with a real fountain,
or maybe just tilt it just a bit ....
Anyway have a look at it, there are also some different solar fountains
available form thsi seller...
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=6060507673 (http://partners.webmasterplan.com/click.asp?ref=284148&site=1382&subid=&type=text&tnb=32&diurl=http%3A%2F%2Fadfarm.mediaplex.com%2Fad%2Fck%2F707-3922-3266-17%3Fmpro%3Dhttp%253A%252F%252Fcgi.ebay.de%252Fws%252FeBayISAPI.dll%253FViewItem%2526item%253D6060507673)
Here is an even better one,
also from an Ebay USA item offer and shipping inside the USA:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=6066633819 (http://partners.webmasterplan.com/click.asp?ref=284148&site=1382&subid=&type=text&tnb=32&diurl=http%3A%2F%2Fadfarm.mediaplex.com%2Fad%2Fck%2F707-3922-3266-17%3Fmpro%3Dhttp%253A%252F%252Fcgi.ebay.com%252Fws%252FeBayISAPI.dll%253FViewItem%2526item%253D6066633819)