lc_switch change backgroud color on error

I use the jquery plugin lc_switch http://ift.tt/1DSuO7u for toggle checkboxes.

HTML CODE :

    <input type="checkbox" name="relation_cse" id="relation_cse" <?php echo $disabled; if ($relation_cse == "1") { echo " checked='checked' "; } ?>value="1" class="lcs_check " autocomplete="off" />

JS CODE on dom ready

    $("#relation_cse").lc_switch('Oui', 'Non');

When i have an error i try to change the backgound color like this but this does not works

   $(".lcs_cursor").css( "background", "red" );
   $('.lcs_switch').css( "background", "red none repeat scroll 0 0" );
   $('.lcs_on').css( "background", "red none repeat scroll 0 0" );

The plugin generate the class over in javascript copy of generated code :

    <div class="lcs_wrap">
    <input id="relation_cse" class="lcs_check " type="checkbox" autocomplete="off" value="1" checked="checked" name="relation_cse">        
    <div class="lcs_switch lcs_on lcs_checkbox_switch">
    <div class="lcs_cursor"></div>
    <div class="lcs_label lcs_label_on">Oui</div>
    <div class="lcs_label lcs_label_off">Non</div>
    </div>
    </div>      

Thanks if someone have an idea !!!