yes to html, css and javascript.

free hosting accounts are limited to the following file types:
.htm, .html, .shtml, .gif, .jpg, .png, .txt, .swf, .mid, .rmi, .au, .wav, .js, .css, .ico, .bmp, .class, .dcr

paid hosting allows pretty much everything else above that.

Alright. Thank you very much, that helped greatly. ^^