急：APPLET嵌入HTML问题 - Java / Java SE

写了一个APPLET有读写XML和读写数据库。在APPLET VIEWER里运行完全正常，
可是我嵌入到一个很简单的HTML里后，就出现问题。
还可以读XML，不能写。可以连数据库，但是在返回结果集 while(rs.next())时就出错了。

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异常信息呢？
谨慎怀疑是安全问题 security

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在HTML就是涉及到这两个操作的地方就是没有任何反应

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java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at hypergraph.ParseXML.SQLServer.<init>(SQLServer.java:47)
at hypergraph.visualnet.GraphPanel.leftClickMouseString(GraphPanel.java:558)
at hypergraph.visualnet.GraphPanel.mouseClicked(GraphPanel.java:517)
at java.awt.AWTEventMulticaster.mouseClicked(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.aw