I can see couple of problems with your code. first is when you say "video/sample.mov", rails will interpret this as :action => "video", :id => "sample.mov" unless this is intended. secondly I really don't think :params => "lightwindow_width=640,lightwindow_height=480" will do any thing.
what your partial should have is something like this.
I'm writing this in a hurry..so come back if you have more questions
I have a problem with a lightwindow media player that i've been using (http://www.stickmanlabs.com/lightwindow).
"lightwindow", :params => "lightwindow_width=640,lightwindow_height=480" %>
However this is something that I can't find the solution to, I've seen somewhere that it may have something to do with the options passed when using "link_to_remote", but I can't find any more info than this despite searching extensively..
any insight would be greatly appreciated