JavaScript

[liowkc]

Google will always penalize JavaScript heavy sites based on the reason that JavaScript may not be accessible to every visitor who are too lazy or ignorant to download JavaScript Runtime.

Make sure you incorporate a pure HTML or XML site map accessible from the home page that will allow Google to index the entire site regardless of the implementation of JavaScript

[life31]

Not only google but also some users dont like them for simple reasons like they give lots of errors, take time ect. And if the script is a bit sofisticated than god save the page from getting crashed in some browsers too

Earlier people used to use JS for menubars and navigation bars but cos of the cons and SEO stuff everyone is now totally dedicated towards using CSS.