Flash or Java

I have decided to complete my project in flash, however if i get chance towards the end I will be attempting to design the website in javascript too. This will allow my users the option of both.

The problem with making the site primarily in flash means it is not compatible with all browsers and users will need to update their flash player.

However, with javascript there runs the risk of users not having installed javascript support for their browsers.

Either way by doing both it should eliminate the risk of some users not being able to use the site.