.x-tree-checkbox{background:url('../../images/icons/16x16/checkbox1.gif') no-repeat 0 0;height:13px;width:13px;margin:0 1px;vertical-align:middle;}.x-tree-checkbox-over .x-tree-checkbox{background-position:-13px 0;}.x-tree-checkbox-down .x-tree-checkbox{background-position:-26px 0;}.x-tree-node-disabled .x-tree-checkbox{background-position:-39px 0;}.x-tree-node-checked{background-position:0 -13px;}.x-tree-checkbox-over .x-tree-node-checked{background-position:-13px -13px;}.x-tree-checkbox-down .x-tree-node-checked{background-position:-26px -13px;}.x-tree-node-disabled .x-tree-node-checked{background-position:-39px -13px;}.x-tree-node-grayed{background-position:0 -26px;}.x-tree-checkbox-over .x-tree-node-grayed{background-position:-13px -26px;}.x-tree-checkbox-down .x-tree-node-grayed{background-position:-26px -26px;}.x-tree-node-disabled .x-tree-node-grayed{background-position:-39px -26px;}