ocx and browsers, compatibility question

[Guest_imported]

My Person Animator series available at

http://explode.to/project2

is going to soon have browser integration. I have an ocx made, but does the viewer of the page need the ocx installed on their hard drive, and do I even need to upload it? and just one more queston, how can I pass a variable to it(, Filename$ being a file uploaded it can view)? I use a wysiwyg html writer, frontpage I think and have netscape 3.01 and internet explorer 4.0.