Vi posto anche un po' di html..

codice:
<select name='cat_5' onchange='selectDisable(5)'>
<option value='0'>--</option>
<option value='LS'>LS</option>
<option value='Q'>Q</option>
<option value='VAR'>...ed altre...</option></select>
<select name='disc_5'>
<option value='0'>--</option>
<option value='1'>1%</option>
<option value='2'>2%</option>
<option value='3'>3%</option>
<option value='..'>..arrivo fino a 100</option></select>
<input name='tsconto_5' type='radio' value='1' class='input2' checked>Si
<input name='tsconto_5' type='radio' value='0' class='input2'>No