My browser can not find jdbc classes !!!!

I am using jdbc database access with Plugin-in an JRE 1.3, the line that gives me the error is this:

symantec.itools.db.beans.jdbc.QueryNavigator _C__DESARROLLO_INTERNO_HojaGastosSectores_Navigator = new symantec.itools.db.beans.jdbc.QueryNavigator();

What can I do? Thanks to all.

java.lang.NoClassDefFoundError: symantec/itools/db/beans/binding/ParentInvalidRecordException

at Prueba.<init>(Prueba.java:59)

at java.lang.Class.newInstance0(Native Method)

at java.lang.Class.newInstance(Unknown Source)

at sun.applet.AppletPanel.createApplet(Unknown Source)

at sun.plugin.AppletViewer.createApplet(Unknown Source)

at sun.applet.AppletPanel.runLoader(Unknown Source)

at sun.applet.AppletPanel.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

[859 byte] By [ireneesm] at [2007-9-26 4:51:28]