Hi Oyewale and welcome to the forum!
Unfortunately, forms created by InfoPath reqire that InfoPath be installed on the client machines. There are solutions out there that allow you to convert the forms you've already made into a web-based solution, but these do not work very well.
InfoPath 2007, however, promises to bring much better web-based support.
Matt Faus / Microsoft InfoPath MVPQdabra® Software / Streamline data gathering to turn process into knowledge