How can I make VBA scripts compatible with browsers other than Internet Explorer?

[Advice Pro]

Exsert from 'Wikipedia' (http://en.wikipedia.org/wiki/VB_Script#Uses):

...web browsers such as Firefox, and Opera do not have built-in support
for VBScript. This means that where client-side script is required on a
web site, developers almost always use JavaScript for cross-browser
compatibility.

 

[Patrick Molloy]

hmmm
isn't VBScript included in the Windows O/S