poliscarhire.com BOOK-IT Button does not work in firefox only

[Leonidas Savvides]

poliscarhire.com BOOK-IT Button does not work at: http://www.poliscarhire.com/ , go ahead and try get quote after press BOOKIT...in a car...with firefox 3/4...

well I designed the site, but work in Opera, Safari and ie7+ but not in firefox, any suggestion make it work in firefox... but still continue work in all other browsers?

This is also posted and here: https://support.mozilla.com/en-US/questions/800709#answer-174362

[Tim McGuire]

error console says form0 is not defined.

look at all the javascript code on that page. every element is addressed by document.something.something...
so...

form0.submit should be

document.forms["form0"].submit()

or

document.form0.submit()

[Bear Bibeault]

That mode of addressing is fragile and antiquated. Add an id value to addressable elements and use document.getElementById().

Welcome to the 21st century!

[Leonidas Savvides]

YOU MEAN BETTER USE id of form tag rather than, name of form tag?
name is only take data from fields?

[Bear Bibeault]

Yes, using id's is the best practice.