indenting in html

[Dominique]

hi,

i'm new to emacs, although I know xemacs a bit. I have problems with 
indenting in html file. It just doesnt work - unlike xemacs, it doesnt 
indent lines when I press TAB. Indenting in c and perl works fine, like 
in xemacs.
I have emacs 21.1.1

Another thing: is it easy to create my own highlighting/indenting scheme 
for my custom language?

please help

dominique