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Chained combobox fails to work

 
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Hi friends,
In my JSP page i want to link one check box with another ie..chained combo box. When i select a option from combo box then the values of the other controls also change.So i decided to write a piece of code that uses JDBC to retrieve data from MySQL and displayed it here. Here is the piece of code that i used to do my job.]

Yes i know this isn't a correct solution and try to do it by some other methods. If you had some idea to put in my post please suggest me one or else tell me whats wrong is in my JSP page...
 
It is sorta covered in the JavaRanch Style Guide.
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