Add Html code to Menu Title in Bartik I am trying to add my own image menu names (I prepared png files) instead of menu titles (Navigate, Category, Home etc.). How can I do this? Which files should I need to check? I know Html Menu module but it does not work on menu titles. 

Thank you.
Firstly I'd say menu titles should be text, for accessibility, maintainability and SEO reasons.

If you must, you could consider using CSS background images by checking the classes or IDs on those menu elements and adding CSS rules target them.