You require malayalam font "MLW-TTKarthika" If you can't read the content of this site properly,most probably the reguired malayalam font(MLW-TTKarthika) is not loaded in your system. Please check whether MLW-TTKarthika is loaded in your system. If not please load it.

Malayalam font available here

Instructions to load in Ubuntu Linux:

Open the command window and Copy the downloaded font into the font directory:
# cp [fonts path] /usr/share/fonts/truetype