/**
* 部门列表的鼠标点击事件
* @Param catLink 被点击的链接组件
*/
function selectDepartment(selectedLi, id){
    var item = document.getElementById(id + '_expand');
    if(item == null){
        window.location = 'departmentHome.action?departmentId=' + id;
    } else {
        var children = selectedLi.parentNode.childNodes;
        for(var i = 0; i < children.length; i++){
            child = children[i];
            if(child.className == 'dep_item_selected_expand'){
                child.style.display = 'none';
            }  else if(child.className == 'dep_item_selected_down' || child.className == 'dep_item_selected'){
                child.className = '';
            } 
            selectedLi.className = 'dep_item_selected_down';
            item.style.display = 'block';
        }
    }
}