problem with background position

[ailinykh]

Hello, everybody!
I try to manipulate with background image and background position.
I need to change background image and background position on the fly.
What I have is a couple of images:

@sprite .i1 {
                        gwt-image: 'image1';
                        width: 65px;
                        height: 12px;
                        cursor:pointer;
                }

        @sprite .i2 {
                        gwt-image: 'image2';
                        width: 65px;
                        height: 12px;
                        cursor:pointer;
                }

and bunch of positions:
.pos1 {
                        background-position: -65px 0px;
        }

.pos2 {
                        background-position: -52px 0px;
        }

<ui:style type='MyStyle'>

then at run time I do something like this:

@UiField MyStyle style;

getElement().addClassName( style.i1);
getElement().addClassName( style.pos1);

When I look at result in browser I see that
gwt-image: 'image1';
line is totally expanded. I see something like this

background: url(data:image/png;base64,ig ... K5CYII=) no-repeat 0px
0px;
background-image: url(data:image/png;base64,iVBO ... CYII=);
background-repeat-x: no-repeat;
background-repeat-y: no-repeat;
background-attachment: initial;
background-position-x: 0px;
background-position-y: 0px;
background-origin: initial;
background-clip: initial;
background-color: initial;

It has
background-position-x: 0px;
background-position-y: 0px;

which overrides background position coming from my second style. Any
ideas how to remove background position from first css?

Thank you,
  Andrey

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