CSS, JS How to BOLD (label) text for Radio button WHEN selected

<label>
  <input type="radio" Name="param" value="1" id="param1"
       onChange="if this.value==1 then BOLD" />
     <span id="param1_label"> Param1 </span>
</label>

how to bold when this button is selected, and   -->  UNbold when not selected ?

thanks

willsherwoodAsked:
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Om PrakashCommented:
<input id="rad1" type="radio" name="rad"><label for="rad1">Radio 1</label>
<input id="rad2" type="radio" name="rad"><label for="rad2">Radio 2</label>

input[type="radio"]:checked+label{ font-weight: bold; }  
 //a label that is immediately preceded by an input of type radio that is checked

http://stackoverflow.com/questions/1431726/css-selector-for-a-checked-radio-buttons-label
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willsherwoodAuthor Commented:
perfect,   easy!!
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