'Enable text field if mentioned conditions met - jsp and java script

In the following image, I want to enable and disable the text-field named "Individual" and "Family" under Annual HSA ER Contribution Limits.

Enable: Enable textbox if only "HEALTH_MEDICAL" is selected in the subtypes and only "Excess credits can be Applied to HSA" is checked.

Disable: Disable textbox if above conditions is not met and make the fields null before disabling them.

The code is written in jsp and I have solved this problem with java but now I want to do it in javascript.

javascript jsp

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