PNG-8 format image opacity problem in IE8 & IE7

/*by garcon1986*/

I use jquery ui library for displaying several tabs with correspondant contents in my project.

It works perfectly in Firefox and Chrome. When I click a tab different from current tab, it will show the content with new tab clicked.

Here is the correct display for my tabs:

Its css is like this:

Just like what you've seen, the border becomes black, which cause my page disgracefully.

The reason is IE doesn't interprete the opacity of png-8 format image correctly. 

For this reason you can use the recommandation solutions of Jack Moore.

Or just change your image format from png-8 to png-24 like me, because IE works with png-24.

Hope this helps! 

Enjoy coding!