I had a problem like that with Swedish. I changed the charset for the page to ISO-8859-1. It worked for Swedish. I don't know what works for Spanish. But I did a google search on the word donde, and found examples with both ISO-8859-1 and utf-8.
Going back to my old website work (Swedish), I see that I used utf-16; I don't know why 16; 8 probably would have been sufficient. I also realized that � shows up in this page alright. It uses the ISO-8859-1 charset. [ April 26, 2007: Message edited by: Roger F. Gay ]