jQuery 1.2.6, UI 1.6 and rounded corners problem

jQuery 1.2.6, UI 1.6 and rounded corners problem


Hello, please sorry for my english.
I have a problem with jQuery UI 1.6 and jQuery 1.2.6.
There are NO rounded corners in all elements, even in example
"index.html" (in downloaded archive contains jQuery UI library) from
official site.
Please, see this screenshot: http://i42.tinypic.com/j6lumx.png
This problem does not depend on browser or UI theme!
Please, help me, i can't use jQuery 1.3 & UI 1.7 for some reasons!