JavaScript Question

I attempted to use a mouseover on my website, which was supposed to swap the 
images.  The original image is supposed to show, except if the mouse is over 
it, and then an alternate image is supposed to show.  They switch, but when 
the mouse is no longer on the image, the alternate image remains there, 
instead of switching back.  The website is 
http://www.geocities.com/dhsbpa_2000/home.html.  The original image is 
supposed to be images/moouseon.jpg.  The alternate is images/mousetwo.jpg.  
If anyone can help, please let me know.   

Also while you are there, please let me know if the music is messed up for 
your browser.  On my computer the music is fine, but on another one it is 
really messed up.  

By the way, my applet just mysteriously started working.  Figure that one out 
:)

Thanks a lot!  This list has been very helpful.

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