I am building my site in php and have found the amazing world of ajax. I have always been weary towards using javascript in the past as I am worried that some browsers won't support it or that users will have turned javascript off.

I now see hundreds and hundreds of sites on the internet which use javascript extensively. Am I living in the past, or should I still be weary of javascript?

The main reason I ask is because I want to use ajax for users to change their password. If javascript is not working on their browser, they will not be able to change their pass.