.gwt-HorizontalSplitPanel {
}

.gwt-HorizontalSplitPanel .hsplitter {
    cursor: move;
    border: 0px; 
    background: #91c0ef url(images/vborder.png) repeat-x;
}
.gwt-VerticalSplitPanel {
}

.gwt-VerticalSplitPanel .vsplitter {
    cursor: move;
    border: 0px; 
    background: #91c0ef url(images/hborder.png) repeat-x;
}