Q:

Is there any other better way than this (modernizr 7 KB javascript) to make round corner for IE 6, IE 7, IE 8?

http://www.modernizr.com/docs/#borderradius only 8KB in size.

A:

Modernizr doen't round corners, that's not what the library is about:
Modernizr is a small JavaScript library that detects the availability of native implementations for next-generation web technologies. With this knowledge that Modernizr gives you, you can take advantage of these new features in the browsers that can render or utilize them, and still have easy and reliable means of creating fallbacks.
These fallbacks are not part of the library.

