select and deselect radio button when i select the drop down list onchange [closed]

Question

I have two selection drop down lsits and four radio buttons.I mean when I select one content of first dropdown list, I get the respective value in sencond drop down list.Now, important question is when i select one value in second dropdown list, I want the first radio button to be default(checked), second and third radio buttons to be disabled and fourth radio button to be disabled. Next time,when i select next one value in second dropdown list, I want the first and second radio button to be disabled, third radio button to be checked and fourth radio button to be enabled.My coding can get the requird condition. In this , I use the onchange function. But when i change the selection of second drop down list, first radio button status still remain when i change the next selection of second drop down list. Pleas help me!