Checkbox label click the checkbox

Use the "for" property of the label control

Example:

<input type=radio name="product_type" id=by_site value="site_part" checked><label for=by_site><b>Site Configuration</b></label>

<input type=radio name="product_type" id=by_part value="part_num"><label for=by_part><b>Part List</b></label>