CSS validator: http://jigsaw.w3.org/css-validator/ xHTML validator: http://validator.w3.org/ upload your files to a server and input the URL into each input bar.
yea - you can do this on w3.org, i did it with my site, in the end I validated my site with HTML 4.01 as XHTML was a pain to correct.
hi, just follow the formatting guidelines of xhtml and validate it using http://validator.w3.org/ Its relatively simple.. e.g. <br> not xhtml, <br/> is xhtml its just formatting..