Styling in FCKEditor

I use these modules:
* Image Browser 6.x-2.x-dev
* Image Browser Plugin - FCKeditor - 6.x-2.x-dev
* FCKeditor - 6.x-2.x-dev

The problem is that I can't fugure why styles with FCKeditor don't work.
I've created 2 styles in admin/settings/imagebrowser/styles

The first is "align-left":

img.ibimage_align-left {
float: left;
padding-right: 3!important;
}

And the second is "align-right":

img.ibimage_align-right {
float: right;
padding-right: 3!important;
}

Also I've included these styles in my style.css theme file.

And when i insert image through Image Browser into FCKEditor and choose one of style image appears without applied style....
But when i click preview it's ok.... why? Why styles don't work in FCKeditor while i write any article... it's very amazing....

There three screenshots in attach.. which show the results...