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Display an image in a GWT Button with IE8
setHTML("<img src=""+image.getURL()+"" />"+someText);

if (Navigator.getUserAgent().matches(".*MSIE.*")){
    this.setStyleName("ieButton");
    setHTML(someText);
}

.ieButton {
    background: transparent url('../img/connect.png') no-repeat;
}

if (Navigator.getUserAgent().matches(".*MSIE.*")){
    String imageName;
    String extension;
    int begin;
    begin = imgr.getURL().lastIndexOf(".");
    extension = imgr.getURL().substring(begin);
    imageName = imgr.getName()+extension;
    this.getElement.getStyle().setProperty("background", "url(''../img/"+imageName+"'')");
    setHTML(someText);
}