How can I handle numbers bigger than 17-digits in Firefox/IE7?

Question

For a web application I want to be able to handle numbers up to 64 bits in size. During testing, I found that javascript (or the browser as a whole) seems to handle as much

Answer 1

As others note, JS implements doubles, so you'll have to look elsewhere to handle bigger numbers. BigInt is a library for arbitary precision math for integers.