Download the Malayalam unicode font Anjali Old Lipi (Click here) and save it .
Open Fonts folder: My Computer> C> Windows> Fonts
Add font, go to: File> Install Anjali Old Lipi New Font.

INTERNET EXPLORER USERS
Start Internet Explorer
Go to: Tools> Internet Options> Fonts> Select Malayalam in Language Script> Select Anjali Old Lipi in Webpage Font
Click OK and OK.

MOZILLA FIREFOX USERS
Start Mozilla Firefox
Go to: Tools> Options> Content> Select Anjali Old Lipi in Fonts & Colors
Click OK

GOOGLE CHROME USERS
Start Google Chrome
Click the spanner image at the right top corner and go to Options> Under The Hood. Then scroll down to Web Content and click Change Font And Language Settings. Select Anjali Old Lipi in Fonts and UTF-8 in Encoding.
Click OK, Click Close.