Hi Jan and welcome to the forum!
Unfortunately, everyone must have InfoPath installed. There are some products out there that will display form created with InfoPath in a browser, but the capabilities are usually limited.
Check out our form viewer here:
http://infopathdev.com/downloads/trials/default.aspx?i=0b8a2bea00d34ed2be2ac16fdd9232bd
If you are looking for the maximum amount of capatability, you might want to look into a sever-side language such as ASP.NET, PHP, or JSP to accomplish this.
Good luck and sorry if I disappointed you!
Matt Faus / Microsoft InfoPath MVPQdabra® Software / Streamline data gathering to turn process into knowledge