[JavaScript] variable "char" is not valid in Safari

I've faced a problem with Safari 2.0 which denies "char" as a name of JavaScript variable.

"char" is one of the future reserved words listed in ECMAScript Language Specification.
Safari 2.0 is strict for them. Safari 3.0 and other major browsers are not so however...
Check it out for your browser here

Original post written in Japanese:
Kawa.net Blog (2007/05/15)