Ms XML 5.0 for safri !!

Hi,
I am a new mac user. my web based application doesnt work on safari. when i try to run that in windows explorer then it asks to install the active x "MSXML 5.0 " , which i can install and can run my web based application.

what do i need to install at safari side? if i want to run the same application in mac.

please help

thanks