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You could use jQuery to select the “for” attribute so you can hide it.

Read up on jQuery selectors:

http://docs.jquery.com/Selectors/attributeEquals

Try this:

<script type="text/javascript">

$(document).ready(function(){

$("label[for='field_3']").css({'display' : 'none'});

});

</script>

You’ll need to have the jQuery library somewhere in your HTML source.