how to get sub-category values for a particular category using select tag in jsp

I have two combo box , one for main category and other for sub category. Now , i want user to select main category whose values are coming from database , and based on that particular category, sub-category(from db) should be shown on the second combo box. I have tried using java script as shown below: or can anyone suggest best possible solution for this.
Is there any problem with this implementation? If so, can you update your post with a specific question? If not (and merely meant as review), please head to codereview.stackexchange.com.

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