Change css properties of a cssresource at runtime

Hi EveryBody!

I need some help in a particular situation using GWT CssResource.

I'm working on a project on which a d'ont have the right to change an existing CSS file without any gwt tag. This Css file defines background for some classes to refer an image URL. I'm using GWT CSSResource an ClientBundle to load all my image a compilation time. Is there a way to change at execution time the backgroung property defines in the CSS to gwt-image  to set image to my images define in ClientBundle?

Exemple : 

--------------------------------------------------------------------------------------------- CSS File

.styleButton {

background: url("image/button.png");

width: 630x;

height: 330px;

margin: 2px;

}

.otherStyle{

background: url("image/other.png");

width: 630px;

height: 360px;

margin: 2px;

}

----------------------------------------------------------------------------------------- CSS Resource

public interface MyCss extends CssResource {

String styleButton();

String otherStyle();

}

------------------------------------------------------------------------------------ Client Bundle

public static final VoltaireResource INSTANCE = GWT.create(VoltaireResource.class);

@Source("myCss.css")

MyCss  myCss();

@Source("button.png")

ImageResource buttonImage();

      @Source("other.png")

ImageResource otherImage();

}

I want to do something like this 

myCss.styleButton().setStyleProperty("gwt-image",  buttonImage().getUrl() )

Thanks

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