How to set radio button from radio group using javascript, HTMLB

Hi guys,
I am trying to set one radio button as checked, from my radio button group using javascript.
This is the code:
     <hbj:radioButtonGroup id='TRAIN_SUB' columnCount="1">
          <hbj:radioButton id="TRAIN_SUB0" text="Not Applicable" key="NA" disabled="true" /> 
          <hbj:radioButton id="TRAIN_SUB1" text="SDF" key="SDF" disabled="true" jsObjectNeeded="TRUE"/>               
     <%     
          ssTrainSubsidy = new String(MAIN_FORM.getParamIdForComponent(TRAIN_SUB));
     %>
     </hbj:radioButtonGroup>
in javascript, i am using this:
               /document.getElementById('<%= ssTrainSubsidy%>')[2].checked =true;
I also tried to access the radiobutton directly, using
          ssTrainSubsidy0 = new String(MAIN_FORM.getParamIdForComponent(TRAIN_SUB0));
but it has null pointer error.
but always have error, anyone can help? thanks!!
Edited by: Feng Guo on Aug 12, 2010 3:44 PM

document.getElementById(radioid).checked =true;
this code will work to select the radio button (set). i think there is a error in the id you placed in ID. place the Radio butoon id and check again. Check this thread on [setting a Radio button|Setting HTMLB RadioButtonGroup Selection using JS;
regards,
Mahesh

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