Border round only for the top of div ...

Hi all,
First, sorry for my english ...

I use RUZEE.ShadedBorder 0.6.2 for add round corner for 2 div ...
when I don't use a .sb-inner background image in my css, the 4 corners of the div are ok (round) when i use a backround image, only the 2 top corner are "rounded", and the 2 bottom corner are not ...

I put in my css :

.sb-inner{background:url(../images/background_black_80pct.png);}

and in my html:

window.addEvent('domready', function() {
var myBorder = RUZEE.ShadedBorder.create({ corner:10, shadow:0 });
myBorder.render('left_cnt');
myBorder.render('content_cnt');
});


I use mootools too and the background image is a .png with opacity.

Anyone have a solution for me ? :D
Thanks for help!

my english suck but I work for better pratice ...

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