Why the table have the space in IE?

Hi all,

I am wonder why it show in Firefox is corrent of the table, but in IE, the right side will add many space between the onMouseOver image, in IE, it show me a wrong layout.

Can anyone teach me how to solve this problems? I want my web site can view by Firefox and IE user.

Thx

http://test.cheungchaubc.org/test1/index2.html