<input type="button" value="选择客户" onclick="window.open('${pageContext.request.contextPath}/CustomerAction_list?select=true','','width=600,height=300')" />

    function selectCustomer(cust_id,cust_name){

        //获得添加页面的window对象

        var win = window.opener;

        //获得添加页面的document对象

        var doc = win.document;

        //获得隐藏域,和 文本框,并赋值

        doc.getElementById("cust_id").value=cust_id;

        doc.getElementById("cust_name").value=cust_name;

        //关闭当前窗口

        window.close();

    };

    <s:if test="#parameters.select==null">

        <a href="${pageContext.request.contextPath }/CustomerAction_toEdit?cust_id=<s:property value="#cust.cust_id" />">修改</a>

        &nbsp;&nbsp;

        <a href="${pageContext.request.contextPath }/customerServlet?method=delete&custId=${customer.cust_id}">删除</a>

    </s:if>

    <s:else>

        <input type="button" value="选择" onclick="selectCustomer(<s:property value="#cust.cust_id" />,'<s:property value="#cust.cust_name" />')" />

    </s:else>