anyone tell me the difference between the above 3?

As far as i know, xhtml is a cross between html and xml.

why should i use xhtml above html?

and what advantages does xml give?

here's an article that might be of some help:

http://www-106.ibm.com/developerwork...y/x-xhtml.html

if that doesn't do it, try a search on google for "advantages of xhtml" or something like that, that's how I found the article above.

Thanks Cmonkey, pretty informative url....