请帮帮忙,我是新手

问题一: class.ForName(sun.jdbc.odbc.JdbcOdbcDriver)到底是加载JDBC
驱动程序还是加载JDBC-ODBC bridge驱动程序?
用jdbc-odbc连接数据库 呢？
我已安装jswdk-1.0.1和 j2sdk1.4.2 是否还需安装JDBC-ODBC

bridge 驱动程序？ java.sql包自带了吗？

问题二：我无论如何也连不上数据库，服务器总出现如下：



JSWDK WebServer Version 1.0.1
Loaded configuration from: file:E:\jswdk-1.0.1\webserver.xml
endpoint created: localhost/127.0.0.1:8080
com.sun.web.core.DefaultServlet: init
com.sun.jsp.runtime.JspServlet: init
Scratch dir for the JSP engine is: work\%3A8080%2F
IMPORTANT: Do not modify the generated servlets
aq.executeQuery:[Microsoft][ODBC 驱动程序管理器] 未发现数据源名称

并且未指定默认
驱动程序
Unhandled error! You might want to consider having an error page

to report such
errors more gracefully
java.lang.NullPointerException
at webpages.faq_jsp_1._jspService(faq_jsp_1.java:98)
at com.sun.jsp.runtime.HttpJspBase.service

(HttpJspBase.java:87)
at javax.servlet.http.HttpServlet.service

(HttpServlet.java:840)
at

com.sun.jsp.runtime.JspServlet$JspServletWrapper.service

(JspServlet.j
ava:88)
at com.sun.jsp.runtime.JspServlet.serviceJspFile

(JspServlet.java:218)
at com.sun.jsp.runtime.JspServlet.service

(JspServlet.java:294)
at javax.servlet.http.HttpServlet.service

(HttpServlet.java:840)
at com.sun.web.core.ServletWrapper.handleRequest

(ServletWrapper.java:155
)
at com.sun.web.core.Context.handleRequest

(Context.java:414)
at com.sun.web.server.ConnectionHandler.run

(ConnectionHandler.java:139)
HANDLER THREAD PROBLEM: java.net.SocketException: Socket is closed
java.net.SocketException: Socket is closed
at java.net.Socket.getInputStream(Socket.java:698)
at com.sun.web.server.ConnectionHandler.run

(ConnectionHandler.java:161)
到底怎莫回事？？请高手们指点迷津，小弟不胜感激！！！


问题二: JavaScript的判断是否为空(例如isEmpty())到底放在哪里?
我觉得应放在HTML语句后面,因为最后提交时才发生判断,但是学

习资料是放在前面