http://www.quirksmode.org/bugreports/archives/safari/index.html "​ works only when a text string is present. When the text consists of numbers only it doesn't work. Test page http://files.rsdn.ru/11521/test.htm Workaround is not included Reported by: Alexander Popov."
I cannot see any problem with stock 10.4.6 Safari or ToT here.
me neither, closing as worksforme.