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setting a radio button

 
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anyone know how to set a radio button checked with javascript? I'm confused because they have the same name...
<input type=radio name='exampleRadio' value='1'>
<input type=radio name='exampleRadio' value='2'>
so if I want to set the value 2 radio button to checked based on some other user action how do I do it? this.formName.exampleRadio.checked...
thnx.
Joe
 
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Here is a brief example:

Note change "on-Click" to "onClick", had to post the code like this
 
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