.x-tree-node img.folder, .x-tree-node-collapsed img.folder{
    background: url("../../extjs/resources/images/default/tree/folder.gif");
}
 
.x-tree-node-expanded img.folder {
    background: url("../../extjs/resources/images/default/tree/folder-open.gif");
}

.x-tree-selected a span {
	font-weight : bold;
}