http://jsfiddle.net/tearex/AXQx4/

regardless of which button is pressed, the returned value is the same. How to correct the condition?

Change your script tag to

$("input[type='radio']").change(function (){
if ($('#item1zest1:checked').val() == 'on') { ccc=1   
}else{ccc=11}
document.DIAGNOSTICS.VARIABLES.value=(ccc)
 });

Here is the link
http://jsfiddle.net/code_rum/aYfbU/

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